The "imap" extension is being removed from PHP itself, * https://github.com/php/php-src/pull/13190 * https://wiki.php.net/rfc/unbundle_imap_pspell_oci8 I already filed a bug against upstream PFA, https://github.com/postfixadmin/postfixadmin/issues/812 but if you really want to keep imap support working in the meantime, you'll probably want to package that PECL extension. If you do, I'll drop USE=imap from dev-lang/php early. Otherwise it will go away (upstream) with the next major version php-8.4.
PostfixAdmin removed this stuff upstream. It should be safe to drop the php[imap] dep in the next release.
postfixadmin-3.3.14 is out
It got removed in the master branch, but it's not in the current release.