unable to use sendmail

sniper8752 · 04-07-2018, 07:34 PM

No, I am not able to.

Why would my isp be blocking it? I don't need to add/modify my iptable rule(s)?

bathory · 04-08-2018, 02:04 AM

Quote:

Originally Posted by sniper8752

No, I am not able to.

Why would my isp be blocking it? I don't need to add/modify my iptable rule(s)?

ISPs usually block outgoing port 25 in order to stop spam from their clients. And also they offer their smtp server as a relay (smarthost).
You can ask them and see what you need to do.

scasey · 04-08-2018, 02:51 AM

^ Yes, it's very typical for an ISP to block port 25. In fact, if an ISP doesn't do that, I'd question using them. Just MHO.

sniper8752 · 04-25-2018, 10:59 AM

They said they do block it, and to use port 587 to get around this. Do you know what they mean/how to do this?

scasey · 04-25-2018, 11:40 AM

Quote:

Originally Posted by sniper8752

They said they do block it, and to use port 587 to get around this. Do you know what they mean/how to do this?

sendmail by default will use port 25. Reconfigure it to use port 587 instead.

I don't use sendmail, so you'll need to search for something like

Quote:

configure sendmail port

or wait for help here.

bathory · 04-25-2018, 12:19 PM

Quote:

Originally Posted by sniper8752

They said they do block it, and to use port 587 to get around this. Do you know what they mean/how to do this?

You should configure sendmail to use an external MTA (like your ISP for example) as a smarthost and to connect to it on the submission port (587) as port 25 is blocked.. Ask you ISP for connection details if you want to use them.
Or you can use a public mailserver, where you have an account, like gmail as a smarthost.

sniper8752 · 05-04-2018, 11:38 PM

Here is what I did:

https://www.qualityology.com/tech/co...other-than-25/

Code:

echo "Subject: sendmail test" | sendmail -v email
WARNING: local host name (server) is not qualified; see cf/README: WHO AM I?
email... Connecting to [127.0.0.1] via relay...
email... Deferred: Connection refused by [127.0.0.1]

bathory · 05-05-2018, 10:50 AM

Quote:

Originally Posted by sniper8752

Here is what I did:

https://www.qualityology.com/tech/co...other-than-25/

Code:

echo "Subject: sendmail test" | sendmail -v email
WARNING: local host name (server) is not qualified; see cf/README: WHO AM I?
email... Connecting to [127.0.0.1] via relay...
email... Deferred: Connection refused by [127.0.0.1]

This is happening because all email clients will try to connect to port 25 by default.

Most important is that changing your local sendmail smtp port it's useless in your case:
That is because your sendmail will still try to connect to port 25 of the recipient's mail server in order to deliver the mail and since outgoing port 25 traffic is blocked by your ISP, you'll still be at the same situation.
Use the example in my previous post in order to setup sendmail to use the submission port (587) of an external smarthost.

sniper8752 · 05-06-2018, 08:06 AM

Would the steps look like this: https://support.google.com/a/answer/2956491?hl=en?

bathory · 05-06-2018, 09:16 AM

Quote:

Originally Posted by sniper8752

Would the steps look like this: https://support.google.com/a/answer/2956491?hl=en?

This looks like a paid service. If you want to pay, then it's ok.
Otherwise use the example in my post #21 to setup a smarthost for your local sendmail to connect through the submission port (587). You can replace gmail in the example with your ISP's smtp and use their credentials in order to use it.

sniper8752 · 05-06-2018, 05:34 PM

I would think this should be public knowledge... Would this be what I am looking for: https://www.xfinity.com/support/arti...-xfinity-email ?

sniper8752 · 05-06-2018, 05:50 PM

If so, I found a tutorial to set this up: https://access.redhat.com/solutions/60803
But when it comes to "Modify the following lines in /etc/mail/sendmail.mc file as shown below:", I can not find these lines. Should I just add them?

scasey · 05-06-2018, 08:01 PM

The way to find out answers to questions like that is to just try it.

sniper8752 · 05-06-2018, 09:24 PM

I am getting this error:

Code:

 (Deferred: Connection refused by [127.0.0.1])

Sounds like a iptables rule missing?

sniper8752 · 05-06-2018, 11:45 PM

running sendmailconfig I notice this:

Code:

Errors in generating sendmail.cf
*** ERROR: FEATURE() should be before MAILER()
*** MAILER(`local') must appear after FEATURE(`allmasquerade')*** ERROR: FEATURE() should be before MAILER()
*** ERROR: FEATURE() should be before MAILER()
*** ERROR: FEATURE() should be before MAILER()
*** MAILER(`local') must appear after FEATURE(`allmasquerade')*** ERROR: FEATURE() should be before MAILER()
*** ERROR: MAILER(local) already included
*** ERROR: MAILER(smtp) already included
*** ERROR: FEATURE() should be before MAILER()

Is this something that should be concerning?