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> Date: Mon, 13 Jul 2015 15:29:17 +0200
> From: Alexander Shukaev <haroogan@gmail.com>
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> $ gnutls-cli --verbose --starttls --tofu -p 587 mail.gandi.net
> Processed 161 CA certificate(s).
> Resolving 'mail.gandi.net'...
> Connecting to '217.70.184.11:587'...
> Connecting to '2001:4b98:c:521::11:587'...
> Could not connect to 2001:4b98:c:521::11:587: Connection refused
> 
> How's that possible?

They mention problems with TLS and recommend using SSL, so maybe you
are not alone.  Try googling for similar problems.

Also, perhaps some SMTP/TLS expert here will chime in.