On Mon, 13 May 2019, Stephen Satchell wrote:
On 5/13/19 12:11 PM, dan...@pyranah.com wrote:
Does anyone have contacts at Charter (Spectrum) and Cox? For some reason,
our IP has been blocked by them and our customers are unable to send email
via their charter/cox accounts. Thanks
Would you be talking about port 25/tcp outbound? Lots of ISPs will
block port 25 as a rule;
If this is the case, that your customers cannot use your mail servers to
relay mail then provide port 587/TCP (SUBMISSION) or even 465/TCP
(SMTPS, deprecated).
If you mean that your mail servers can't send mail to Charter and Cox
addresses, then indeed you need to find out what happened, fix it then
request removal from their (and other) blacklists for which contacts
there would be helpful (I am not one).
/mark
