When comparing Astroid vs gnus, the Slant community recommends gnus for most people. In the question“What are the best native e-mail clients for Linux?” gnus is ranked 14th while Astroid is ranked 19th. The most important reason people chose gnus is:
Yep, really. From Outlook-mode, where Outlook-typical TOFU mails are “repaired”, up to a high-sophisticated scoring and SPAM filtering, footer lines with quotes, rules depending on the recipient, MIME formatting, boxquotes, etc.
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Pros
Pro Everything is customizable
Yep, really. From Outlook-mode, where Outlook-typical TOFU mails are “repaired”, up to a high-sophisticated scoring and SPAM filtering, footer lines with quotes, rules depending on the recipient, MIME formatting, boxquotes, etc.
Pro It supports IMAP and POP3
… but you can use DavMail to connect to Exchange server via EWS.
Cons
Con Difficult documentation
Originally a newsgroup reader, so its documentation uses Usenet terminology for everything -- which is confusing.