| Syntax: |  protocol 
   |  
|---|---|
| Default: | — | 
| Context: |  server |  
Sets the protocol for a proxied server. Supported protocols are IMAP, POP3, and SMTP.
If the directive is not set, the protocol can be detected automatically based on the well-known port specified in the listen directive:
-  
imap: 143, 993 -  
pop3: 110, 995 -  
smtp: 25, 587, 465 
 Unnecessary protocols can be disabled using the configuration parameters --without-mail_imap_module, --without-mail_pop3_module, and --without-mail_smtp_module. 
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