POSTFIX and smtp.comcast.net

I am trying to set up postfix on my machine at home so that I can send emails (mailx command on Fedora Linux).

Is there any documentation available that explains how to set this up specifically for computers on Comcast's network?

Searching online has not revealed anything useful. I am not an email expert.

Responses

BruceW

Gold Problem Solver

•

26.3K Messages

2 years ago

I am trying to set up postfix on my machine at home so that I can send emails ...

Don't know if it's what you are looking for, but the general instructions are given in https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

0

Postfix works. You'll need to setup sasl for the authentication, and send the mail to smtp.comcast.net:587 (relayhost option). You also need to setup a certificate for the SSL/TLS part. Certbot is easy for that. This guide should get you pretty close: https://phoenixnap.com/kb/postfix-smtp Shows you the password file, options you need.

What is your fully qualified domain name on a residential account? Look at whatismyipaddress.com, and click on your IPV4 address. Something like c-xxx-xxx-xxx-xxx-state-comcast.net

(edited)

2

0

JohnWhitehead

Regular Visitor

•

5 Messages

Thank you both. Good news is postfix is working. Bad news is I did not make any changes since before I posted my question.

I did what I needed to in terms of SASL and the password_maps file. Edited main.cf, did the reload. Went to bed and at 5 AM got an email from that server saying my nightly backup failed. Then I was also able to send email directly from the command line. I do not know why it works.

Thanks for your help. Hopefully this continues to work.

2 years ago

0

flatlander3

Problem Solver

•

1.5K Messages

@JohnWhitehead Nice thing about postfix instead of using a utility like msmtp is the mailq system. If your smtp server upstream is down, or network conditions are bad, the mail stays in the mail queue until it can be sent. You can also relay mail from other devices/machines on your local network.

2 years ago

0

Email

JohnWhitehead

POSTFIX and smtp.comcast.net

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

flatlander3

JohnWhitehead

flatlander3

New to the Community?