Email Marketing

Email la kenh so huu — khong phu thuoc thuat toan, khong mat tien tiep can lai nguoi da dang ky.

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Thu thap thong tin

Hoi user toi da 4 cau:

1. San pham/dich vu gi? Mo ta ngan + doi tuong khach hang.
2. Muc tieu email? Thu lead moi, nurture lead cu, ban hang, hay re-engage khach cu?
3. Da co list email chua? Bao nhieu subscriber? Da phan loai nhom chua?
4. Dang dung tool nao? Brevo, Mailchimp, Kit, hay chua co? Da setup domain chua?

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Nguyen tac cot loi

Nguyen tac	Giai thich
Gia tri truoc ban hang	80% email cung cap gia tri, 20% email ban hang
Phan khuc truoc gui	Khong bao gio gui cung 1 email cho toan bo list
1 email = 1 muc dich	Moi email chi co 1 CTA chinh
Mobile-first	70%+ doc email tren dien thoai — thiet ke cho man hinh nho truoc
Test lien tuc	A/B test subject line va thoi gian gui moi tuan
Ton trong nguoi nhan	Co link unsubscribe ro rang, khong spam

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Cau truc 1 email

Thanh phan	Gioi han	Vai tro
Subject line	50 ky tu (30 ky tu hien thi tren mobile)	Quyet dinh open rate
Preview text	90 ky tu	Bo sung cho subject line, tang open rate
Header	Logo + ten thuong hieu	Nhan dien nhanh
Body	150–300 tu (nurture), 100–200 tu (promotion)	Noi dung chinh
CTA	1 CTA chinh, toi da 1 CTA phu	Chuyen doi
Footer	Unsubscribe + dia chi + lien he	Tuan thu phap luat

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Cong thuc Subject Line

5 cong thuc hieu qua

Cong thuc	Vi du	Khi dung
Curiosity (To mo)	"Dieu 90% nguoi lam sai khi [chủ de]"	TOFU, nurture
Benefit (Loi ich)	"[Ket qua] trong [thoi gian] — day la cach"	MOFU, nurture
Urgency (Khan cap)	"Con 24h — [uu dai] het han ngay mai"	BOFU, promotion
Personalization (Ca nhan)	"[Ten], minh co thu nay cho ban"	Re-engage, VIP
Number (So lieu)	"5 buoc de [dat ket qua] — buoc 3 quan trong nhat"	Giao duc, nurture

Quy tac subject line

• Viet ngan, khong qua 50 ky tu
• Khong dung ALL CAPS
• Tranh spam trigger: "Mien phi", "100%", qua nhieu dau cham than
• Test 2 subject line moi lan gui (A/B test)
• Preview text phai bo sung, khong lap lai subject line

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Phan khuc doi tuong (Segmentation)

Theo hanh vi

Nhom	Tieu chi	Email phu hop
Active	Mo email trong 30 ngay gan nhat	Tat ca loai email
Warm	Mo email 31–60 ngay truoc	Nurture + offer nhe
Cold	Khong mo email 60+ ngay	Re-engage sequence
Engaged	Click link trong 14 ngay	Offer cu the, BOFU
New	Dang ky trong 7 ngay	Welcome sequence

Theo lich su mua hang

Nhom	Tieu chi	Email phu hop
Chua mua	Dang ky nhung chua mua	Nurture → Trial offer
Da mua 1 lan	Mua 1 lan, chua quay lai	Re-purchase offer + cross-sell
Khach trung thanh	Mua 3+ lan	VIP offer, loyalty, referral
Khach cu (Churned)	Mua truoc, khong hoat dong 90+ ngay	Win-back offer

Theo muc do quan tam

Nhom	Tieu chi	Email phu hop
Quan tam [A]	Click vao noi dung ve [chu de A]	Noi dung sau ve [A]
Quan tam [B]	Click vao noi dung ve [chu de B]	Noi dung sau ve [B]
Chua xac dinh	Chua click du de phan loai	Survey email hoac noi dung da dang

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Sequence Template

Welcome Series (3 email — gui khi dang ky moi)

#	Thoi diem	Subject line	Noi dung chinh	CTA
1	Ngay lap tuc	"Chao mung [Ten] — day la mon qua cho ban"	Gioi thieu thuong hieu + giao gia tri ngay (ebook, checklist, voucher)	Download/Su dung ngay
2	+2 ngay	"[Ten], 3 dieu ban nen biet ve [thuong hieu]"	Cau chuyen thuong hieu + gia tri khac biet + social proof	Doc them tren blog/website
3	+4 ngay	"Cach [thuong hieu] giup [X nguoi] dat duoc [ket qua]"	Case study/Testimonial + CTA den buoc tiep theo	Dat lich / Xem san pham

Nurture Sequence (5 email — gui sau Welcome)

#	Thoi diem	Chu de	Loai noi dung
1	+7 ngay	Giai quyet pain point #1	Giao duc — chia se kien thuc
2	+10 ngay	Giai quyet pain point #2	Giao duc — huong dan cu the
3	+14 ngay	Social proof manh	Case study + so lieu ket qua
4	+17 ngay	Soft offer	Gioi thieu san pham/dich vu nhu giai phap
5	+21 ngay	Hard offer + khan cap	Uu dai co thoi han + CTA manh

Re-engage Sequence (3 email — gui cho nhom Cold)

#	Thoi diem	Subject line	Noi dung chinh	CTA
1	Ngay 1	"Lau roi khong gap [Ten] — minh nho ban"	Nhac lai gia tri + hoi co con quan tam khong	Click de tiep tuc nhan email
2	+3 ngay	"[Ten], day la thu minh danh rieng cho ban"	Offer doc quyen cho nguoi quay lai	Su dung offer
3	+7 ngay	"Email cuoi cung — ban co muon tiep tuc?"	Thong bao se ngung gui neu khong phan hoi	Click de o lai / Tu dong xoa

Promotional (1 email don le hoac chuoi 2–3 email)

#	Thoi diem	Vai tro
1	3 ngay truoc	Thong bao — "Sap co uu dai dac biet"
2	Ngay khai truong	Offer chinh — gia, loi ich, deadline, CTA
3	24h truoc het han	Nhac nho — "Con 24h" + khan cap

Transactional (tu dong theo hanh dong)

Trigger	Email	Noi dung
Dat hang thanh cong	Xac nhan don hang	Chi tiet don + buoc tiep theo
Thanh toan thanh cong	Hoa don / Bien lai	So tien, ma don, lien he ho tro
Dat lich thanh cong	Xac nhan lich hen	Thoi gian, dia diem, chuan bi gi
Hoan thanh dich vu	Cam on + khao sat	Hoi trai nghiem + de nghi review

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Automation Flow

Flow co ban

Trigger: [Hanh dong cua user]
  │
  ├── Gui email 1 (ngay lap tuc)
  │
  ├── Doi 2 ngay
  │
  ├── Dieu kien: Da mo email 1?
  │   ├── Co → Gui email 2A (noi dung tiep theo)
  │   └── Khong → Gui email 2B (subject line khac, noi dung giong)
  │
  ├── Doi 3 ngay
  │
  ├── Dieu kien: Da click link trong email 2?
  │   ├── Co → Chuyen sang nhom "Engaged" → Gui offer
  │   └── Khong → Gui email 3 (gia tri cao, thu hut lai)
  │
  └── Ket thuc sequence → Chuyen sang email dinh ky

Flow Welcome → Nurture → Convert

Dang ky moi
  │
  ├── Welcome Email 1 (ngay) — Chao mung + qua
  ├── Welcome Email 2 (+2 ngay) — Cau chuyen
  ├── Welcome Email 3 (+4 ngay) — Social proof
  │
  ├── Dieu kien: Da click bat ky link nao?
  │   ├── Co → Nhom "Warm" → Bat dau Nurture Sequence
  │   └── Khong → Nhom "Cold" → Re-engage Sequence
  │
  ├── Nurture 1–5 (+7 den +21 ngay)
  │
  ├── Dieu kien: Da mua hang?
  │   ├── Co → Chuyen sang Post-purchase flow
  │   └── Khong → Offer cuoi + khan cap → Chuyen sang email dinh ky
  │
  └── Email dinh ky (1/tuan) — 80% gia tri, 20% offer

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A/B Test Plan

Thu tu test (uu tien cao truoc)

Uu tien	Yeu to	Bien the A	Bien the B	Chi so do	Mau toi thieu
1	Subject line	Curiosity	Benefit	Open rate	500 email/bien the
2	Thoi gian gui	8:30 AM	8:00 PM	Open rate	500 email/bien the
3	CTA	Button mau cam	Button mau xanh	Click rate	500 email/bien the
4	Do dai email	Ngan (150 tu)	Dai (300 tu)	Click rate	500 email/bien the
5	Ten nguoi gui	Ten thuong hieu	Ten ca nhan	Open rate	500 email/bien the

Quy tac A/B test email

• Chi test 1 yeu to moi lan
• Chia deu random: 50/50 hoac 20/20/60 (test nho truoc, gui phan thang cho winner)
• Doi toi thieu 24h truoc khi ket luan
• Toi thieu 500 email moi bien the de co y nghia thong ke
• Luu ket qua test vao spreadsheet de tich luy kien thuc

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Thoi gian gui toi uu — Viet Nam

Khung gio	Hieu qua	Ly do	Loai email phu hop
8:00–9:00 AM	Cao	Dau ngay lam viec, kiem tra email	Nurture, giao duc, B2B
12:00–1:00 PM	Trung binh–Cao	Nghi trua, luot dien thoai	Promotion, uu dai
8:00–9:00 PM	Cao	Toi, thu gian, doc email ca nhan	Promotion, re-engage, B2C
6:00–7:00 AM	Trung binh	Nguoi day som, truoc khi di lam	Newsletter, digest

Luu y:

• Ngay gui tot nhat: Thu 3, Thu 4, Thu 5 (tranh Thu 2 ban va cuoi tuan)
• Tranh gui: ngay le, Tet, 30–31 hang thang (nhieu email khac canh tranh)
• B2B: gui trong gio hanh chinh (8AM–5PM)
• B2C: gui ngoai gio hanh chinh (12PM trua, 8PM toi)

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Nhanh Zalo OA — kenh so huu thu hai

O Viet Nam, Zalo OA doc cao hon email rat nhieu nhung giay phep hep hon: gui nhieu la mat follower, khong lay lai duoc. Coi Zalo la kenh "danh cho tin quan trong", email la kenh "danh cho noi dung dai".

Zalo OA vs Email — chon kenh cho tung loai tin

	Email	Zalo OA
Read / Open rate tham chieu	15-25% TB · 25-35% tot	40-60% TB · 60-80% tot · >80% xuat sac
Do dai phu hop	Dai — ke chuyen, giao duc, nhieu link	Rat ngan — 3-6 dong, 1 y duy nhat
Tan suat an toan	1-3 lan/tuan tuy sequence	Toi da 2-3 lan/tuan, an toan nhat <= 2 lan/tuan
Chi phi	Gan nhu mien phi theo goi tool	Tinh theo tin gui — ~500d/tin (TB), ~300d (tot), <200d (xuat sac)
Rui ro khi lam qua	Vao spam, unsubscribe	Follower bam bo quan tam — mat vinh vien
Loai tin phu hop	Nurture, giao duc, newsletter, chuoi dai	Nhac lich, xac nhan don, uu dai gioi han, tin khan

Gioi han va ky luat gui Zalo

Nguyen tac	Nguong	Ly do
Tan suat broadcast	<= 2 lan/tuan (tran 3)	Vuot nguong la ty le bo quan tam tang manh
Ty le bo quan tam moi broadcast	< 5%	Vuot 5% → dung broadcast, xem lai noi dung va tep
Read rate	>= 40% moi chap nhan duoc; muc tieu 60-80%	Duoi 40% = tep khong dung hoac tin khong lien quan
Ca nhan hoa	Bat buoc co ten nguoi nhan hoac phan khuc ro	Broadcast chung chung cho ca list = tin spam
Phan khuc	Phai chia tep theo hanh vi / lich su mua	Gui uu dai san pham A cho nguoi vua mua A la mat uy tin

Ve han muc va chi phi tin: so tin va cach tinh phi thay doi theo goi OA va theo loai tin (broadcast vs tin cham soc vs ZNS). Kiem tra chinh sach hien hanh cua Zalo OA truoc khi lap ke hoach gui — dung gia dinh theo so cu.

Ty le noi dung broadcast

Loai noi dung	Ty trong	Vi du
Gia tri (huong dan, meo, kien thuc)	40%	"3 dau hieu cho thay ban dang [van de]"
Cau chuyen / cap nhat	30%	Hau truong, cau chuyen khach hang, tin moi cua brand
Bang chung xa hoi	20%	Review, ket qua khach hang, con so
Offer / ban hang	10%	Uu dai, deadline

Dao nguoc ty le nay (gui toan offer) la cach nhanh nhat de mat list Zalo.

Cau truc 1 tin Zalo OA

[Dong 1 — hook ngan, <= 40 ky tu, noi thang van de hoac loi ich]
[2-4 dong noi dung — 1 y duy nhat, cau ngan, xuong dong ro rang]
[1 CTA duy nhat — dong tu + loi ich cu the]
[Link rut gon kem UTM]

Quy tac viet tin Zalo:

1. 1 tin = 1 y = 1 CTA. Khong nhoi 2 uu dai vao 1 tin.
2. Khong copy nguyen email sang Zalo. Email 300 chu → tin Zalo 60-80 chu.
3. Ca nhan hoa ten nguoi nhan ngay dong dau khi co the.
4. Link phai co UTM (utm_source=zalo&utm_medium=oa&utm_campaign=...) — neu khong se khong tach duoc dong gop cua Zalo khoi organic.
5. Khong gui ngoai khung gio — tin Zalo bat len man hinh khoa, gui sai gio la lam phien that su.

Khung gio gui Zalo tot (Viet Nam)

Khung	Phu hop
7:00 - 8:30 sang	Nhac lich, tin can hanh dong trong ngay
11:30 - 12:30 trua	Offer, noi dung ngan de luot
20:00 - 21:30 toi	Noi dung ca nhan, cau chuyen, uu dai B2C

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Sequence email + Zalo chay song song

Khong chay 2 kenh doc lap. Ghep vao 1 lich duy nhat de tranh cham nhau va tan dung the manh tung kenh.

Mau sequence 14 ngay (nurture → chot)

Ngay	Email	Zalo OA	Ghi chu phoi hop
D+0	E1 — Welcome, gui tai lieu, set ky vong	Tin xac nhan ngan: "Da gui [tai lieu] vao email cua ban"	Zalo dam bao nguoi dung biet co email — tang open rate E1
D+2	E2 — Cau chuyen / ly do lam nghe	—	Noi dung dai, chi hop email
D+4	E3 — Kien thuc / meo huu ich	Tin gia tri ngan trich tu E3 + link doc day du	Zalo keo nguoi chua mo email quay lai
D+6	E4 — Bang chung xa hoi (case study)	—
D+8	E5 — Xu ly objection lon nhat	—
D+10	E6 — Chao offer (soft pitch)	Tin thong bao offer, 1 CTA	Zalo lam nhiem vu "danh thuc"
D+12	E7 — Push urgency + FAQ	—
D+14	E8 — Nhac lan cuoi / breakup	Tin nhac deadline (chi gui cho nguoi da click nhung chua mua)	Tin cuoi cua Zalo chi gui tep hep, khong broadcast ca list

Luat phoi hop:

1. Zalo khong gui trung ngay voi email quan trong — tru ngay D+0 (xac nhan) va ngay chot deadline.
2. Tong tin Zalo trong 14 ngay: toi da 4 tin. Vuot la vi pham tran 2 tin/tuan.
3. Tin Zalo o cuoi sequence chi gui cho tep da tuong tac (da mo email hoac da click), khong broadcast toan bo.
4. Email lam viec nang (giai thich, thuyet phuc), Zalo lam viec nhac — dung bat Zalo lam nhiem vu cua email.

Do luong 2 kenh chung

Chi so	Email	Zalo OA
Do mo	Open rate	Read rate
Do quan tam	CTR (>= 3%)	Ty le click / tin
Do phien toai	Unsubscribe (< 0.5%/email)	Bo quan tam (< 5%/broadcast)
Do dong gop	Lead / don gan UTM utm_medium=email	Lead / don gan UTM utm_medium=oa

Doi chieu 2 cot nay hang thang trong 13-phan-tich-du-lieu. Kenh nao chi phi/lead thap hon thi tang ty trong o sequence sau — nhung khong pha tran tan suat Zalo.

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Deliverability — Dam bao email vao Inbox

Checklist ky thuat bat buoc (SPF, DKIM, DMARC, domain rieng, warm-up, list hygiene) + lich warm-up domain moi theo tuan + quy tac tranh spam: doc references/deliverability-tool-va-kpi.md muc "Deliverability — Dam bao email vao Inbox".

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Tool khuyen dung — Viet Nam

Bang so sanh 3 tool (Brevo, Mailchimp, Kit) theo free tier, gia, diem manh, khi dung + 7 buoc setup Brevo co ban: doc references/deliverability-tool-va-kpi.md muc "Tool khuyen dung — Viet Nam".

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Tuan thu phap luat

Bang 5 yeu cau PDPA Viet Nam (Nghi dinh 13/2023/ND-CP) kem cach thuc hien + checklist compliance 6 diem: doc references/deliverability-tool-va-kpi.md muc "Tuan thu phap luat".

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KPI va Benchmark

Bang benchmark VN 6 KPI hang tuan (open rate, CTR, CTOR, unsubscribe, bounce, spam complaint) chia 4 muc Kem/TB/Tot/Xuat sac + 4 KPI hang thang kem cong thuc: doc references/deliverability-tool-va-kpi.md muc "KPI va Benchmark".

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Template ket qua

Khung markdown day du 8 muc (Muc tieu · Phan khuc doi tuong · Welcome Sequence · Nurture Sequence · Lich gui dinh ky · Automation Flow · A/B Test Plan · Checklist thiet lap): doc references/template-ket-qua-email.md va copy nguyen khung de dien noi dung.

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Lien ket skill

• 09-insight-khach-hang — hieu pain point de viet email nurture dung noi dau
• 05-copy-quang-cao — dung chung cong thuc copywriting cho subject line va body
• 01-lich-noi-dung — dong bo email voi lich content tong the
• 12-brief-landing-page — landing page la dich den cua CTA trong email
• 13-phan-tich-du-lieu — phan tich hieu suat email marketing hang tuan/thang
• 15-social-listening — bat xu huong de tao noi dung email kip thoi
• 49-html-email-template — dung template HTML cho email (bo cuc, responsive, dark mode) sau khi chot noi dung
• 53-tracking-setup — chuan hoa UTM cho ca email va Zalo OA de tach duoc dong gop tung kenh

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Checklist chat luong

Truoc khi gui moi email

• Subject line < 50 ky tu, preview text < 90 ky tu
• Chi co 1 CTA chinh
• Link hoat dong (click test tung link)
• Hien thi tot tren mobile (test tren dien thoai that)
• Co link unsubscribe
• Khong co loi chinh ta hoac loi ten (merge tag test)
• Test spam score (Brevo co san)

Truoc khi bat automation

• Flow logic dung (ve so do ra giay)
• Dieu kien re nhanh hoat dong (test ca 2 nhanh)
• Thoi gian delay hop ly
• Exit condition ro rang (khi nao nguoi dung ra khoi flow)
• Khong trung lap voi email dinh ky khac

Hang thang

• Review open rate va click rate — so voi thang truoc
• Xoa email bounce khoi list
• Cap nhat phan khuc dua tren hanh vi moi
• Lam moi subject line dua tren ket qua A/B test
• Kiem tra list growth rate

Rieng nhanh Zalo OA

• Tan suat broadcast <= 2 lan/tuan (tran 3) — dem ca thang truoc khi len lich
• Ty le noi dung dung chuan 40 gia tri / 30 cau chuyen / 20 bang chung / 10 offer
• Moi tin <= 6 dong, 1 y, 1 CTA duy nhat — khong copy nguyen email sang Zalo
• Tin da duoc ca nhan hoa hoac gui theo phan khuc, khong broadcast chung chung
• Link co UTM utm_medium=oa de tach duoc dong gop
• Gui trong khung gio (7:00-8:30 · 11:30-12:30 · 20:00-21:30)
• Read rate >= 40%, muc tieu 60-80%; ty le bo quan tam < 5%/broadcast
• Lich Zalo va lich email da ghep chung — khong cham nhau trong cung 1 ngay (tru D+0 va ngay chot)