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I need port 25 unblocked for an email server

I have some posts suggesting that I pay for some extended support to get port 25 unblocked; that is ludicrous, I already pay for static netblock, I will not pay extra to use my static netblock the it *should work anyways*. How do I get port 25 opened up? Thanks.

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Email NDR because of supposed invalid PTR (rDNS) record.

Hello, I am a sysadmin trying to find out why our emails are being rejected by AT&T. The email is being sent from $user@$domain.com on a hosted Microsoft Exchange server mail.$domain.com to the recipient $email@bellsouth.net and we are getting a 550 5.7.1 NDR.  Sanitized version o

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