Current HEAD requires aiosmtpd>=1.0a5
The current HEAD at https://gitlab.com/mailman/mailman/commit/d4f8bac7cc5a85b177f122ba78f3f837238027f6 requires aiosmtpd >=1.0a5, but the commit at https://gitlab.com/mailman/mailman/commit/abbc6436ec580d424b2128a78f06b06ec6e7143c added only aiosmtpd
to the install_requires list in setup.py. The requirement should be aiosmtpd>=1.0a5
.