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Trouble getting emails sent via Apple Mail AND via my

I am having difficulties sending emails to certain (not all) parties.  Oddly, it mostly seems it affects friends living in TX and PA.  I often will get the following pop-up when I hit “Send”  - but NOT always:

! An error occurred inside the server which prevented it from fulfilling the request.

No other direction or detail is provided to trouble-shoot.  This error message does not always show up and I only know that a party has NOT received my emails after days go by without getting a response (and I get confirmation from them later that they never got my email).

I use Apple Mail and updated my mail server settings earlier in 2018 per Cox’s direction & specifications.

For incoming I have mail set to / Port #993 using TLS/SSL

For outgoing I have mail set to / Port #465 using TLS/SSL

My OS is Sierra 10.12.6 and I diligently install all security/software updates Apple posts for Safari and my computer.

I’ve even deleted my username & password and re-entered them in both my in-coming & out-going email server settings per one of the Forum’s suggestions to another customer with a similar issue - but that has not resolved my problem.  My trouble sending emails described above also occurs when I use as a work around.  Any advice is much appreciated. 

  • Hi MissyKay. There are no security concerns as both are secure servers. The only difference is they use different security protocols. Here is a different link to use - If you are getting this error when you try to send email through, we need to address this. Please send us an email at and include this link, your complete address and name on the account to get started. Thanks, Lisa - Cox Support Forums Moderator
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