??????????????????

???????????????????????

??????

?????????????/h2>

????????????????????????????????????????????????????????????????????????????????

  • MTA??ail Transfer Agent???????????????????????????????????? SMTP ?????FC 5321??????????????????????? MTA ?????? Postfix??xim??endmail ????/li>
  • MDA??ail Delivery Agent???????????????????????????????????????????????????MTA ????????ovecot ??LDA/LMTP??rocmail ?????? MDA??/li>
  • MUA??ail User Agent??????????????????????????????????????? IMAP??FC 9051??? POP3??FC 1939???????????????????? Outlook??hunderbird??oxmail ????/li>

????????TA ?????????????"?????????????????DA ???????"??????????????????????MUA ????????????????????"??

???????????????

?????????????????????????????????????????????????????????????????

  • Postfix????????????????MTA??????????????????????????????????? Linux ???????????????????? Dovecot ???????????????????????"??/li>
  • Exim???????????????MTA??? Debian ??????????????????????????????????????????????/li>
  • Microsoft Exchange???????????????????????Windows ????? Active Directory?????????????????????????/li>
  • ??????????????/strong>??? TurboEx/??????????????????????????????????????????????????????????????????????????????????????????????????/li>

??????????????

???????????????????????????????????????????????????????????????????????????????????????????????????

?????? ??????????br>(Postfix+Dovecot) ?????????
(TurboEx/???)		 ????????br>(???/???/???)
?????? ????? Linux ????????????????????/td> ?????????????????????????? ???????????????
?????? ?????????????????????????? ????????????????????/td> ?????????????????SLA
?????/strong> ?????????????????????????? ??????????????? DLP/???/??? ??????????????????????/td>
???????? ???????????????????/td> ??????????????UOS/???/????????/td> ?????/td>
?????/strong> ??????????????? ??????????????????????????/td> ???????????????
????????/strong>????????? Linux ??????????????????Postfix + Dovecot ?????????????????????????????????????????????????????????????????TurboEx/?????????????????????????????????????????????????????????????????????

??????????????/h3>

??????????????????TurboEx ????????????????????/strong>????????????????????????????

  • ???????????SPF/DKIM/DMARC ??????????????? DNS ??????
  • ????????????99.5% ???????????????
  • ????????????????????/???/????????????/??? UOS ??????
  • ??? 6000+ ?????????????????????????????
  • ?????????Webmail??indows/macOS ??????????OS/Android/??? APP

???????????????

????????Postfix + Dovecot ??Ubuntu/CentOS ??????????????????????????DNS ???????????????????

1 ?????DNS ???

????????????????????????????????DNS ?????????????????? example.com??????????????? mail.example.com??/p>

  • A ?????? mail.example.com ???????????? IP ???
  • MX ????????example.com ??MX ?????? mail.example.com????????? 10
  • PTR ????????????????????????????????????????????? IP ???????????? mail.example.com??????????????????????????????
?????/strong>??????????????? 25 ?????????????????????????????????????????????????SMTP 25 ????????? 587??ubmission?????????????

2 ???????????/h3>

??Ubuntu 22.04 LTS ????????????????????????

# ??????
sudo apt update && sudo apt upgrade -y

# ????????sudo hostnamectl set-hostname mail.example.com

# ????????hostname -f

3 Postfix ????????????SMTP??/h3> 
# ??? Postfix
sudo apt install postfix -y

# ??????????? "Internet Site"
# System mail name ???: example.com

??? Postfix ????????/etc/postfix/main.cf???????????/p> 

# ??????
myhostname = mail.example.com
mydomain = example.com
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 127.0.0.0/8

# TLS ????????? 5??smtpd_tls_cert_file = /etc/letsencrypt/live/mail.example.com/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mail.example.com/privkey.pem
smtpd_use_tls = yes

# ?????????
home_mailbox = Maildir/

???????????Postfix??/p> 

sudo systemctl restart postfix
sudo systemctl enable postfix

4 Dovecot ?????????IMAP/POP3??/h3> 
# ??? Dovecot
sudo apt install dovecot-core dovecot-imapd dovecot-pop3d -y

??? Dovecot ?????? /etc/dovecot/dovecot.conf??/p> 

protocols = imap pop3 lmtp
listen = *
mail_location = maildir:~/Maildir

??? IMAP ??POP3 ??TLS ?????code>/etc/dovecot/conf.d/10-ssl.conf???

ssl = required
ssl_cert = </etc/letsencrypt/live/mail.example.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/mail.example.com/privkey.pem

??? Dovecot??/p> 

sudo systemctl restart dovecot
sudo systemctl enable dovecot

5 SSL/TLS ??????

??? Let's Encrypt ?????????????????? TLS ?????/p> 

# ??? Certbot
sudo apt install certbot -y

# ???????????80 ?????????
sudo certbot certonly --standalone -d mail.example.com

# ?????????
sudo crontab -e
# ????? 3 * * * certbot renew --quiet --post-hook "systemctl restart postfix dovecot"

6 SPF/DKIM/DMARC ??????

????????????????????????????????????????/p>

  • SPF??ender Policy Framework??/strong>??? DNS ?????TXT ??????????????????????????????????/li> 
# DNS TXT ???????????mail.example.com ???????????????
example.com  TXT  "v=spf1 mx a:mail.example.com ip4:203.0.113.0/24 ~all"
  • DKIM??omainKeys Identified Mail??/strong>?????????????????????????????????????????????????/li> 
# ??? OpenDKIM
sudo apt install opendkim opendkim-tools -y

# ??? DKIM ???
sudo opendkim-genkey -s default -d example.com

# ??????????????DNS TXT ???
default._domainkey.example.com  TXT  "v=DKIM1; k=rsa; p=..."
  • DMARC??omain-based Message Authentication, Reporting & Conformance??/strong>???????????????????? SPF/DKIM ??????????/li> 
# DNS TXT ??????
_dmarc.example.com  TXT  "v=DMARC1; p=quarantine; rua=mailto:postmaster@example.com; pct=100"

7 ????????/h3>

???????????????????????????????????????

  • ???????????/strong>??? mail ??sendmail ?????????????/li>
  • MX ??????????? dig example.com MX ??? MX ?????????
  • SPF/DKIM/DMARC ???????? MXToolbox ??Mail Tester ?????????
  • ??????????telnet mail.example.com 25 / telnet mail.example.com 587
  • ???????????/strong>??Gmail/Outlook ???????????????????????????????/li>

??????????????/h2>

??????????????/h3>

??????????????????????????????????/p>

??? ??? ????/th> ???
SMTP 25 ??????????????TA??TA??/td> STARTTLS??????
SMTP Submission 587 ?????????????????/td> STARTTLS??????
SMTPS 465 ?????????????????? SSL/TLS??????
IMAP 143 ???????????/td> STARTTLS??????
IMAPS 993 ?????????????????/td> SSL/TLS??????
POP3 110 ???????????/td> STARTTLS??????
POP3S 995 ?????????????????/td> SSL/TLS??????
??????????????????????587??MTP Submission????93??MAPS??? 995??OP3S??????????????5 ??????????????????????????? MTA ????????????????????

???????????/h3>

????????????????????????????????????????????????????/p>

  • Rspamd???????????????????????????????????????????NS ??????DNSBL????PF/DKIM/DMARC ??????????????????????????????/li>
  • SpamAssassin????????????????????????????????????????????????/li> 
# ??? Rspamd
sudo apt install rspamd -y

# ?????Postfix??etc/postfix/main.cf ?????smtpd_milters = inet:127.0.0.1:11332
milter_default_action = accept
milter_protocol = 6

??????????????/h3>
  • ????????/strong>Postfix ?????/var/log/mail.log??ovecot ?????/var/log/dovecot.log
  • ????????/strong>mailq ??????????????????postqueue -f ?????????
  • ????????/strong>???????????????????????????????????
  • ????????/strong>???????/var/log/auth.log ??? SASL ?????????????????/li>

??????

??????????????iPhone ??????

iPhone ???????????????????????????????????????????????????

  • SSL/TLS ????????/strong>???????????????????????SSL ?????? Let's Encrypt???iPhone ?????iOS ??????????????????????????????????? iPhone ??????????????/li>
  • ???????????/strong>iPhone ??????????????? IMAP ??? 993??SL???????????SMTP ??? 587??TARTTLS??? 465??SL????/li>
  • ???????????/strong>??? iPhone ????????????????SSL ?????CN/SAN ?????????/li>
  • ??????????????????????????????993 ??587/465 ?????/li>
  • ???????????/strong>??????????????????????????????????????????SMTP ?????/li>

?????????????????

????????????????????

  • ?????? MX ????????/strong>????????? dig example.com MX ??? MXToolbox ???????????/li>
  • ??????????????????????/strong>???????????smtp.exmail.qq.com / imap.exmail.qq.com???????????? smtp.mxhichina.com / imap.mxhichina.com??/li>
  • ??????????????????????MX ?????????????????mail.example.com??/li>

??? vs ?????????????????/h3>

??????????????????

  • ????????/strong>??? Linux ??????????????????????????????????????????????????????????????????????????????/li>
  • ??????????????/strong>??????????????????????????????????????? SLA ?????????????/li>

????????????????????/h3>

?????????????????????????????

  • ???????????????????G?????? ?100~500/????????????????????5,000~20,000
  • ????????/strong>???50~100/??/li>
  • SSL ?????/strong>Let's Encrypt ????????????500~5,000/??/li>
  • ????????Postfix+Dovecot???????????????????????????
  • ????????? TurboEx/???????????????????????????????????????????????????????????/li>

📥 30 ????????TurboEx ??????

SPF/DKIM/DMARC ?????????????????????????????????/p> ??????

????????/h1>

???????????????????????

??????????????/a>