대량 메일 어떻게 잘 발송할까?
DESCRIPTION
대량 메일을 잘 발송하기 위해서 알아야 할 내용 설명TRANSCRIPT
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SMTPMTA(Message Transfer Agent)
MUA(Mail User Agent)
SMTP�Protocol
Envelope,�Letter
- Envelopeõ LetterN »ßÜ ó: � ]ó.
Envelope,�Letter
êf� ^ ~Ü f BóB., ì�êÉ MS Z}� �B ¬ãó.
Anti�Spam
·Ú �ãrV Ñ1a BS^ÊU
Authentication: SPF, Sender ID, DKIM
Reputation: Blacklist, Volume/rate, Uservoting, Bounce mgt, Behavior
Content Filtering: Images, Copy,Construction, Subject, Linkes
Reverse�DNS
- Reverse DNS À� å�
Authentication�:�SPF,�DKIM
- SPFõ DKIMA DNSN îÚ^: S�êÑ Ñè IP É è1a: (U
- HTMLÉ l� !Ö: �Bêff ,ºèN �kÉ l� �VB �BêÜ ØïB Jóº ,�Sk
N »UB (UêÜ Øï� 6�
SPF(Sender�Policy�Framework)- SPF îÚ^Ü .rUB �ÀêÑ SrVB z� ]Ü rV ºè: 0�êÜ DNS îÚ^N ì
6�- SPF bÇ .�¾ / Test Tool
SPF�DNS�Record�Example
ecplazamail.net. IN TXT "v=spf1 ip4:203.242.210.222 -all"
$ dig ecplazamail.net text +short
DKIM(Domain�Key�IdentifiedMail)
- rVN ��É iÛ/ 'º�'B �B- �1aÜ .rU º�B l�êÑ rVS 3����aN .rUɺ �è@Ä?{ �è ��ɺ
ÿ�@Û ��ÜÛ Ñ�: (U Bã
DKIM�DNS�Record�Example
mail._domainkey.ecplazamail.net. IN TXT "v=DKIM1; k=rsa; p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAOMdamAlekOqG/saQ9Pg/ieKxC34FBJjIeV3M413rGPjfObCW2zBz2UKm0ipUtDJLG/efKB+NNvS3OpqIe7UYQqNsGv396eshqpc+uxaCTpvBS6aCgxhFR8RDjyEvIdOeQIDAQAB"
$ dig mail._domainkey.ecplazamail.net text +short
Facebook�email�example
Bounces
What happens when mail could not bedelivered?
- 5xx- Mail Delivery Notification (MDN)
- Delivery Status Report (DSN)
Return�Path
- Return Path is another name for theenvelope sender
- It's the address to which bounces shouldbe sent
- It's usually the same as the From:address
- But can be changed in transit usingschemes like SRS
VERP(Variable�EnvelopeReturn�Paths)
- User replies go to [email protected] Bounces go to bounces-
Return-Path : <[email protected]>From : "my list" <[email protected]>To : [email protected] : a message
Welcome to my world!!!
Hard�Bounce
- Recipient email address does not exist- Domain name does not exist
- Recipient email server has completelyblocked delivery
Soft�Bounce
- Mailbox is full(over quota)- Recipient email server is down or offline
- Email message is too large
Contents�Filtering
- Don't use IP address for links(http://193.24.33.1/page/)
- using both text and HTML or text only- The higher the text to link and text to
image ratios, the better- Unsubscribe link: ö^/ ø�Ê
Throttling
Limit send speed per domain
450 too frequent connects from 198.37.147.135, please try again later. (throttled)
ì�Y
- Ñè B&k �B- IP Reputation �B
Thank�You�ggg