Sendmail - Different smpt port and server for VM

Dear Users,
I’ve been running into issues with receiving voicemail e-mails. My att does allow emails from port 21 or 25. So I’ve been using port 587. However I can’t seem to get sendmail to accept these port changes and change the smtp server to my own. I guess if its possible I could still use sendmail but just use port 587 if thats possible. However right now I’ve edited etc/mail/sendmail.mc. I have the following line:
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define(`SMART_HOST’, ‘mail.mydomain.com’)dnl

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I’ve done the m4 sendmail.mc > sendmail.cf as well, then restarted the sendmail server and also rebooted my server just for good measure! I’ve also defined a feature to supply the auth/pass but I’ve commented that out because I first just want to be able to even connect to my server. When I look at my mailog it as follows:

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ec 28 15:40:30 phoneserver2 sendmail[4049]: oBSLeU3r004049: to=root@phoneserver2, delay=00:00:00, mailer=local, pri=38120, dsn=4.4.3, stat=queued
Dec 28 15:42:09 phoneserver2 sendmail[4075]: oBSLg652004075: from=root, size=3, class=0, nrcpts=0, msgid=201012282142.oBSLg652004075@phoneserver2, relay=root@localhost
Dec 28 15:53:26 phoneserver2 sendmail[4295]: alias database /etc/aliases rebuilt by root
Dec 28 15:53:26 phoneserver2 sendmail[4295]: /etc/aliases: 76 aliases, longest 10 bytes, 765 bytes total
Dec 28 15:53:26 phoneserver2 sendmail[4300]: starting daemon (8.13.8): SMTP+queueing@01:00:00
Dec 28 15:53:27 phoneserver2 sm-msp-queue[4308]: starting daemon (8.13.8): queueing@01:00:00
Dec 28 15:56:56 phoneserver2 sendmail[4372]: oBSLuuU1004372: from=root, size=18624, class=0, nrcpts=1, msgid=Asterisk-7-1901704426-105-2546@phoneserver2, relay=root@localhost
Dec 28 15:56:57 phoneserver2 sendmail[4380]: oBSLuur3004380: from=root@phoneserver2, size=18748, class=0, nrcpts=1, msgid=Asterisk-7-1901704426-105-2546@phoneserver2, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Dec 28 15:56:57 phoneserver2 sendmail[4372]: oBSLuuU1004372: to=“105” [email protected], ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=48624, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBSLuur3004380 Message accepted for delivery)
Dec 28 15:56:58 phoneserver2 sendmail[4382]: oBSLuur3004380: to=[email protected], ctladdr=root@phoneserver2 (0/0), delay=00:00:02, xdelay=00:00:01, mailer=relay, pri=138748, relay=‘mail.mydomain.com.net’, dsn=5.1.2, stat=Host unknown (Name server: ‘mail.mydomain.com.net’: host name lookup failure)
Dec 28 15:56:58 phoneserver2 sendmail[4382]: oBSLuur3004380: oBSLuwr3004382: DSN: Host unknown (Name server: ‘mail.mydomain.com.net’: host name lookup failure)
Dec 28 15:56:58 phoneserver2 sendmail[4382]: oBSLuwr3004382: to=root@phoneserver2, delay=00:00:00, mailer=local, pri=49986, dsn=4.4.3, stat=queued

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Any hints on what I’m doing wrong?