There's a closed pull request on the void-packages repository

sylpheed: patch to use SNI
https://github.com/void-linux/void-packages/pull/23487

Description:
Prior to this patch, sylpheed built against newer versions of LibreSSL could
not connect to IMAP server such as gmail's because it did not use SNI. This
patch from OpenBSD is a simple fix to implement it.

This fix is documented in the upstream bug tracker here: [https://sylpheed.sraoss.jp/redmine/issues/306](https://sylpheed.sraoss.jp/redmine/issues/306) and in the OpenBSD CVS here: [https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/mail/sylpheed/patches/patch-libsylph_ssl_c](https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/mail/sylpheed/patches/patch-libsylph_ssl_c)

If there is anything I missed or anything I could have done better while contributing, please let me know. Thanks for any reply.