how do I change postfix port from 25 to 587?

I am total noob about Unix and CLI. after googling for almost 6 hours I came to know I should be editing postfix port from 25 to 587 for PHP mail() function to work. and here is the solution I got http://www.linuxmail.info/postfix-change-port/ but I am not sure how to change it. as already said I am a noob. any help regarding this will be appreciated.

UPDATE1 :

grawity solution gives me the following error.

May  7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/pickup[4169]: DE2073F07C1: uid=501 from=<azhararmar>
May  7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/master[4185]: fatal: open lock file pid/master.pid: unable to set exclusive lock: Resource temporarily unavailable
May  7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/cleanup[4177]: DE2073F07C1: message-id=<20110506191239.DE2073F07C1@Ibrahim-Armars-MacBook-Pro.local>
May  7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/qmgr[4168]: DE2073F07C1: from=<azhararmar@Ibrahim-Armars-MacBook-Pro.local>, size=525, nrcpt=1 (queue active)
May  7 00:42:40 Ibrahim-Armars-MacBook-Pro postfix/smtp[4179]: DE2073F07C1: to=<azhar@iarmar.com>, relay=smtp.gmail.com[74.125.155.109]:587, delay=0.8, delays=0.01/0/0.79/0, dsn=4.7.5, status=deferred (TLS is required, but our TLS engine is unavailable)
May  7 00:42:41 Ibrahim-Armars-MacBook-Pro postfix/pickup[4169]: 5F2FC3F07C4: uid=501 from=<azhararmar>
May  7 00:42:41 Ibrahim-Armars-MacBook-Pro postfix/cleanup[4177]: 5F2FC3F07C4: message-id=<20110506191241.5F2FC3F07C4@Ibrahim-Armars-MacBook-Pro.local>
May  7 00:42:41 Ibrahim-Armars-MacBook-Pro postfix/qmgr[4168]: 5F2FC3F07C4: from=<azhararmar@Ibrahim-Armars-MacBook-Pro.local>, size=525, nrcpt=1 (queue active)
May  7 00:42:42 Ibrahim-Armars-MacBook-Pro postfix/smtp[4179]: 5F2FC3F07C4: to=<azhar@iarmar.com>, relay=smtp.gmail.com[74.125.155.109]:587, delay=0.79, delays=0.01/0/0.78/0, dsn=4.7.5, status=deferred (TLS is required, but our TLS engine is unavailable)
May  7 00:42:50 Ibrahim-Armars-MacBook-Pro postfix/master[4190]: fatal: open lock file pid/master.pid: unable to set exclusive lock: Resource temporarily unavailable

UPDATE 2 :

May  7 01:10:02 Ibrahim-Armars-MacBook-Pro postfix/master[4472]: fatal: open lock file pid/master.pid: unable to set exclusive lock: Resource temporarily unavailable
May  7 01:10:02 Ibrahim-Armars-MacBook-Pro postfix/pickup[4419]: 357F73F090F: uid=501 from=<azhararmar>
May  7 01:10:02 Ibrahim-Armars-MacBook-Pro postfix/cleanup[4430]: 357F73F090F: message-id=<20110506194002.357F73F090F@Ibrahim-Armars-MacBook-Pro.local>
May  7 01:10:02 Ibrahim-Armars-MacBook-Pro postfix/qmgr[4420]: 357F73F090F: from=<azhararmar@Ibrahim-Armars-MacBook-Pro.local>, size=525, nrcpt=1 (queue active)
May  7 01:10:03 Ibrahim-Armars-MacBook-Pro postfix/smtp[4448]: certificate verification failed for smtp.gmail.com[74.125.155.109]:587: untrusted issuer /C=US/O=Equifax/OU=Equifax Secure Certificate Authority

Ibrahim Azhar Armar

Posted 2011-05-06T16:20:32.807

Reputation: 253

By the way, make sure that you only have one copy of "master" running... – user1686 – 2011-05-06T20:42:02.533

Answers

According to your comments on other answers, you need to configure Postfix to use Gmail as a relay host. There are many tutorials on the Internet for this; here's a quick version.

Note: With this configuration, all mail must be sent using your Gmail address as "From".

Undo all your changes to master.cf.

In main.cf, add these settings:

# This tells Postfix to hand off all messages to Gmail, and never do direct delivery.
relayhost = [smtp.gmail.com]:587

# This enables TLS (SMTPS) certificate verification, because Gmail has a valid one.
smtp_tls_security_level = verify
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_session_cache_database = btree:/var/run/smtp_tls_session_cache

# This tells Postfix to provide the username/password when Gmail asks for one.
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

In /etc/postfix/sasl_passwd, add your Gmail username and password, like this:
```
[smtp.gmail.com]:587    user@gmail.com:mypassword
```
Compile the sasl_passwd file into a database:
```
postmap /etc/postfix/sasl_passwd
```
Finally reload Postfix's main configuration:
```
postfix reload
```

user1686

Posted 2011-05-06T16:20:32.807

Reputation: 283 655

i am trying it, will get back to you with result. thank you so much. – Ibrahim Azhar Armar – 2011-05-06T19:05:08.093

i followed the exact same as mentioned by you. placed all codes on main.cf file on top of the file and created a file sasl_passwd still it gives me the above error – Ibrahim Azhar Armar – 2011-05-06T19:16:29.380

It looks as if you have not properly set up SSL (encryption) on your system. In order to help you with that, people would need to know your operating system (e.g. Ubuntu, Fedora, Debian?) and what if any SSL packages you have installed. For what it's worth, I have PostFix set up on my own system to use my ISP's relay host and it works great. – CarlF – 2011-05-06T19:35:34.043

@Ibrahim: There might be two problems there. 1) The smtp_tls_CAfile setting is likely to be incorrect: I wrote it based on a Linux system, forgetting that you are on OS X. Try commenting it out (prefix the line with a #), then lower the security level from verify to encrypt. Reload Postfix. 2) If that doesn't fix the problem, then it might mean that Postfix was built without TLS support. It's unlikely, but possible... – user1686 – 2011-05-06T19:40:25.067

s/forgetting/not knowing/. Got confused there. – user1686 – 2011-05-06T19:53:33.717

@Grawity yes it does say [certificate verification failed for smtp.gmail.com[74.125.155.109]:587: untrusted issuer /C=US/O=Equifax/OU=Equifax Secure Certificate Authority] in the error. i tried checking the certificate path and it seems doesnt exist. now where do i get that certificate from? – Ibrahim Azhar Armar – 2011-05-06T19:57:00.013

wow, thank you so so much, i commented smtp_tls_CAfile and it started working. thank you once again :) – Ibrahim Azhar Armar – 2011-05-06T20:07:36.853

@Ibrahim: In OS X, programs are supposed to read CA certificates from the Keychain. I don't know how to make Postfix use it, though (you should post this as a separate question). But as an alternative, you can get ca-certificates.crt as part of the "curl" package from MacPorts. – user1686 – 2011-05-06T20:40:59.040

If you only want it running on port 587 (and I'm not sure you do; I'd think you'd want it running on both 25 and 587), then find the line in /etc/postfix/master.cf that looks like this:

smtp      inet  n       -       n       -       -       smtpd

And change it to look like this:

587      inet  n       -       n       -       -       smtpd

If you want it running on both ports, then add the second line after the first one rather than replacing it.

Wes Hardaker

Posted 2011-05-06T16:20:32.807

Reputation: 1 796

i edited master.cf files using sudo. the value has been updated , i restarted the computer too but still it takes port 25 as default value. what could be possibly wrong? :( – Ibrahim Azhar Armar – 2011-05-06T18:23:02.997

okay the values are being set to default after sometime, i don't know why even when i add the values and save it using :wq in vim it just come back to default value again and again. – Ibrahim Azhar Armar – 2011-05-06T18:24:59.173

@Ibrahim: I think you forgot to mention something. Are you trying to make all email go through a single server, smtp.something.com:587? – user1686 – 2011-05-06T18:34:13.003

1@Wes: FYI, master.cf already contains an entry for this port; it's labelled submission. – user1686 – 2011-05-06T18:34:56.327

yes i am trying to send all mails through 587 port. as that is what my isp allows – Ibrahim Azhar Armar – 2011-05-06T18:36:35.280

@Ibrahim: But are you trying to relay them through a single relay server (i.e. smtp.your-isp.com), or are you hoping to send directly to port 587 of the recipient's server? – user1686 – 2011-05-06T18:44:31.730

i am really not sure about all this. all i wanted was my php mail function to work, as i am using MAMP and it uses postfix to send mails to recipients, my ISP have blocked port 25 and have asked me to use either port 587 or 465. i use smtp.gmail.com as my mail server. what would be the possible solution for this to work? – Ibrahim Azhar Armar – 2011-05-06T18:52:16.887

1@Ibrahim: In that case, you will have to configure Postfix to use Gmail as a relay host. I will post instructions in a separate answer -- for now, revert all changes to master.cf. – user1686 – 2011-05-06T18:56:48.833

thank you grawity that will be really of great help, i already wasted the whole day trying to solve the problem – Ibrahim Azhar Armar – 2011-05-06T18:58:13.357