On 05/20/2016 12:28 PM, Mark Sapiro wrote:
Could sendgrid ahve something to do with this?   Are they filtering my
>mails of a pattern that has been failing before?

Possibly.

Your confirmations are

Reply-To:catjuggling-requ...@cibolo.us
Subject: confirm <long_hex_string>

There have been reports, e.g.,
<https://mail.python.org/pipermail/mailman-users/2016-May/080805.html>,
that this Subject: triggers spam filters.

Try setting

VERP_CONFIRMATIONS = Yes

in mm_cfg.py. this will make the message have

Reply-To: catjuggling-confirm+<<long_hex_string>@cibolo.us
Subject: Your confirmation is required to join the catjuggling mailing list

That may help.

I have not changed VERP_CONFIRMATIONS yet, but I enabled smtp sending via 
dovecot sasl authorization
and the mail was handled, delivered, and the list state updated to having that 
new member.

The new member was one of the virtual mailbox users on the same server with 
postfix, mailman, dovecot
so there was not much chance of catjuggling-request behaving differently than a 
catjuggling post.

I'll try VERP_CONFIRMATIONS = Yes and send via sendgrid again to test that.

Thanks,

John Griessen
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