IRED mail , server settings

POP3 service: port 110 over TLS (recommended), or port 995 with SSL.
* IMAP service: port 143 over TLS (recommended), or port 993 with SSL.
* SMTP service: port 587 over TLS.
* CalDAV and CardDAV server addresses: https://<server>/SOGo/dav/<full email address>

Adding c2a email use port 25  imap setup 
For more details, please check detailed documentations:
https://docs.iredmail.org/#mua

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