How to block receiving emails from a specific mailbox in Zimbra?

Question

Mail server

Good afternoon. There is an email address that sends spam, is it possible to block it without blocking the entire domain?

Answer 1

Blocking emails from a specific address is easy.
There are three ways:
1) block in postfix settings (Zimbra is based on postfix)
2) block in spamassasin settings (Zimbra uses Spamassasin if antispam is enabled)
3) block in specific user settings (create a filter by logging in to the web interface)
Path # 1 most radical:

### команды нужно выполнять из пользователя zimbra
su - zimbra

### создадим файл если его нет, или добавим строчку
echo "[email protected] REJECT" >> /opt/zimbra/conf/postfix_reject_sender
postmap /opt/zimbra/conf/postfix_reject_sender

### добавим в настройки Zimbra Postfix проверку smtpd_sender_restrictions
zmprov ms $(hostname) zimbraMtaSmtpdSenderRestrictions "check_sender_access lmdb:/opt/zimbra/conf/postfix_reject_sender"

### можем подождать 1-2 минуты, пока zmconfigd применит настройку, либо перезапустить Postfix
zmmtactl restart

In general, you should think about connecting an external anti-spam filter. Built-in Zimbra - Amavis + Spamassasin + ClamAV - requires too much attention and fine tuning :)