Hi everyone, I've just come across something unexpected.
I have a customer that has their email hosted by Gandi (French domain registrar/hosting company) and can't send out emails because Gandi are using a subset of Spamhaus' RBL (XBL/SBL it seems) to filter access to mail submission (SMTPSA on port 465).
Their support website even indicate that. And the solutions listed there are either to get de-listed by Spamhaus (good luck with that when using a dynamic IP or CGNAT), use the ISP mail server to send out mails (which will then fail SPF/DKIM...) or use the Gandi webmail (sure, that works, but the customer looses the benefits of their fully-fledged mail client).
Using Spamhaus RBL to filter access to mail submissions seems to me to be a weird and unwise thing to do. What do you people think?
If anyone from Gandi is on this list, can you see how that design choice is a bit problematic for end-users?
Thanks, Antonin
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