The net-mail team is looking for maintainers for | mail-mta/sendmail | mail-mta/exim.
If you are a dev, just start maintaining them. For users wanting to help, send a mail to net-m...@g.o Beside these two MTAs there is a number of packages in the net-mail herd that could benefit from a active maintainer too. If you want to help us or take over a package from the net-mail herd, don't hesitate to contact us. Thanks