14 Email Marketing

Email Marketing

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

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?

Nguyen tac cot loi

Cau truc 1 email

Cong thuc Subject Line

5 cong thuc hieu qua

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

Phan khuc doi tuong (Segmentation)

Theo hanh vi

Theo lich su mua hang

Theo muc do quan tam

Sequence Template

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

Nurture Sequence (5 email — gui sau Welcome)

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

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

Transactional (tu dong theo hanh dong)

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

A/B Test Plan

Thu tu test (uu tien cao truoc)

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

Thoi gian gui toi uu — Viet Nam

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)

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

Gioi han va ky luat gui Zalo

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

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)

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)

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

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.

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".

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".

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".

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".

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.

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

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)