I tried to set up the outgoing mail server for my Outlook 2007 with a 3rd party mail server. e.g. mail.xxxx.com, and I could not send the e-mail at all. If I set up the outgoing mail server as outgoing.verizon.net, I can send the email to everyone else but not to this 3rd party mail server mail.xxxx.com. I received the undeliverable message from Verizon that the mail was rejected due to not being able to log on to this 3r party mail server. I am working for this company from home and it requires me to set up this for my outgoing mail server. Does anyone know how to fix this, including specifying what needs to be done at the 3rd party mail server to change to accept emails sent from outgoing.verizon.net? Thank you in advance. Andy
Verizon blocks the ports used for SMTP email sending for address outside the Verizon network if you are a residential customers. This has been the case for some time. The only way to send email to an SMTP server off the Verizon network if you are a residential customer is for the server to use a non-standard port assignment.
Thank you for the feedback, Matthew. Can you please clarify the non-standard port assigment? If I understood you correctly that the 3rd party mail account has to set up the SMTP port with its own specific number.
Will business account allow me to use 3rd party mail server as outgoing mail server?
Thanks a lot for your expertise.
Port 25 is the standard for SMTP, although some now use a submission port, 587. I know port 25 off network is blocked for residential users, I don't know if 587 is blocked off network because I have never tried it. I suspect it is. Verizon is by no means the only ISP to do this.
Business accounts do not have blocked ports as far as I know, so if you have a business account, you are free to communicate using port 25 anywhere.
Verizon has recently gone to non-standard port assignments for SMTP and POP servers. see
The last I've checked Port 587 is blocked. Port 25 is most certainly blocked, so the OP will need to move to alternate ports supported by their mail provider.