Need help in tracing packets on email

Is there any user manual in wireshark on email.
ex: I send a mail to a printer & check how mail is transferred to mail server -pop3/imap/smtp.
Is there any user guide for this?
Please refer me some videos & good tutorials for beginers.
Thanks in advance

This may be a little basic, but filtering based on the ports that those protocols run on would be a great start to analyzing email traffic. This a great site for what ports mail protocols run on. Hope this helps.

Hmm, The CentOS KVM can be smart enough, but even though they’re not actively in use, Windows clients are always active…