For IKR reference purposes only.
Comcast
imap.comcast.net Port 993 (SSL)
smtp.comcast.net Port 587 (TLS/SSL) 465
Pop3: pop3.comcast.net 995 (SSL)
Verizon
POP3
pop.verizon.net 995 SSL
smtp.verizon.net 465 SSL
IMAP
imap.aol.com 993 SSL
smtp.verizon.net 465 SSL
Spectrum
IMAP
mobile.charter.net 993 (SSL)
mobile.charter.net 587 (SSL)
RR.com
mail.brighthouse.com