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Port 25 - Things to know from AT&T

Port 25 Blocked Port 25 is blocked over AT&T internet. The reasons for this is to provide a more secure internet connection and reducing the amount of spam and viruses that come through Port 25. It is estimated that 80% of the e-mail traffic carried on the network is spam. Spammers have become

Questions

 • AT&T Internet Security

5.1K

7

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Accepted Solution

Official Solution

Open Port 25 for my ATT Business account

Hi we have a Business Fiber 300 internet account and I seem to be blocked on port 25 as I am trying to setup an in house email server.  Can someone help me open this port up for sending emails? Thanks

Questions

 • AT&T Fiber Account

834

1

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Accepted Solution

Official Solution

Using 3rd Party E-mails with your AT&T Account

        If the previous steps did not help with your issue, please send a private message with your account number and contact details to ATTU-verseCare for further assistance. If you are not a member of the U-verse community forums, we welcome you to r

Questions

 • AT&T Internet Security

1.4K

1

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Need Port 25 unblocked.

Had the same problem a year ago, all of a sudden port 25 got blocked and I couldn't sent outgoing mail via the U-verse connection. Modem/router NVG510 is set to pass SMTP Port 25, so the problem is not there, just as it wasn't a year ago. A year ago a lower tier tech support agent resolved it on the

Questions

 • AT&T Internet Features

581

6

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Need port 25 unblocked

Was existing At&t customer. Our company moved locations and we moved service to new location. apparently that doesn't include any settings or configurations. spent the day trying to figure out why we could receive but not send email after the move. All things appear to be pointing toward port 25 bei

Questions

 • AT&T Internet Security

109

2

0

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Port 25

I need to have port 25 unblocked so I can host email for my small business. Is that at all possible?

Questions

 • AT&T Internet Security

303

1

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outbound SMTP email failing

I know there have been many posts on this, but I can't seem to get resolution in spite of my reading them. Have AT&T uverse InternetCould not send outbound aol email at all.  Could receive fine.Read the existing posts about port 25 being blocked by AT&T uverse. Called and had tech support unblock po

Questions

 • AT&T Internet Security

1.6K

3

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U-verse blocking port 25 outbound - and doesn't want to unblock it for residential customers

Hello, I've been a customer of AT&T on U-verse service a long time but recently after my contract renewal the sales person told me that they had to change my equipment - I was suprised but I let them do it. Today when the tech showed up he was suprised to see my old equipment in place and told me th

Questions

 • AT&T Internet Features

684

5

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SMTP TCP/IP Port 25 Outbound

Hello,I am a small buisness and have recently switched my modem using the following email.(https://equipmentupgrade.att.com/emails/followup1.html)Since I switched them all my ports have been undone and set to default. I need the TCP/IP port 25 unblock as it is by default on AT&T Modems. Can someone

Questions

 • AT&T Internet Features

440

1

0

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Unblock port 25 for small email server

Hello. I have a home office and I run MS Exchange 2010 for home/business emails. (4 users) I just recently changed my Internet access to AT&T Uverse.My server is receiving Inbound emails perfectly. OUTBOUND emails are not going out.(stuck in MS Exchange queue) I have been using this server for 16 ye

Questions

 • AT&T Internet Security

312

1

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How to unblock port 25 for my email server?

To whom it may concern: I have just installed a mail server and the mail server will receive emails but it seems like it can't send out emails through the smtp ATT server. I checked out and it looks like Port 25 for emails have been blocked by ATT. I have investigated in the ATT community and was to

Questions

 • AT&T Internet Security

499

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