Can Sonic tech support chime in on this issue I'm having?
I'm trying to reply to a return address on a mailing list I'm on, but Sonic's SMTP server keeps thinking it's a malformed address, even though it's legal.
I've seen discussions online that this can be a configuration option or fixed by a server patch.
Any idea why your SMTP server doesn't like this address? I've masked part of it for privacy:
I'm trying to reply to a return address on a mailing list I'm on, but Sonic's SMTP server keeps thinking it's a malformed address, even though it's legal.
I've seen discussions online that this can be a configuration option or fixed by a server patch.
Any idea why your SMTP server doesn't like this address? I've masked part of it for privacy:
SMTP Error (501): Failed to add recipient "reply+BIGLONGSTRINGHERE@mg1.substack.com" (5.0.1 reply+BIGLONGSTRINGHERE@mg1.substack.com is not a valid fully qualified email addresss [cerb:INVRCPT]).