AT&T’s e-mail servers are blocking connections from Microsoft 365 attributable to a “high volume” spam wave originating from Microsoft’s service.
Beginning on Monday, AT&T prospects started reporting they might not obtain e-mail from Microsoft 365 e-mail addresses.
When Microsoft 365 prospects tried to e-mail an deal with at @att.com, @sbcglobal.internet, or @bellsouth.com, AT&T servers would refuse the connection and never settle for the e-mail for supply.
Motive: [{LED=450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=att.net] [LastAttemptedIP=144.160.159.21:25]
[SmtpSecurity=-2;-2] [MW2NAM10FT061.eop-nam10.prod.protection.outlook.com
2024-05-08T15:33:54.328Z 08DC6E49E2071EB6]};{MSG=Socket error code 10061};{FQDN=att.internet};{IP=144.160.159.. OutboundProxyTargetIP:
144.160.159.22. OutboundProxyTargetHostName: att.internet
Motive: [{LED=450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=bellsouth.net]
[LastAttemptedIP=144.160.159.22:25] [SmtpSecurity=-2;-2] [CO1NAM11FT004.eop-nam11.prod.protection.outlook.com
2024-05-08T15:54:34.984Z 08DC6EC21DF48CA1]};{MSG=Socket error code 10061};{FQDN=bellsouth.internet};{IP=. OutboundProxyTargetIP: 144.160.159.22.
OutboundProxyTargetHostName: bellsouth.internet
Since then, AT&T prospects have created quite a few matters with a whole bunch of replies within the firm’s boards concerning the problem [1, 2, 3, 4], with some claiming it additionally impacts Gmail.
“Same problem. Can’t send from multiple 365 accounts or gmail… only to att.net domain… Hey ATT… I cant even email your SALES guys… get this working…,” reported somebody making an attempt to ship an e-mail to an AT&T deal with.
“I’m having the same problem: nothing from a gmail account is getting into my email account (sbcglobal.net), and nothing is being bounced back to the sending gmail accounts. It’s just vanishing. Yet everything was working a few hours ago,” a sbcglobal.internet person posted.
BleepingComputer couldn’t independently affirm whether or not Gmail emails are having points as nicely.
AT&T advised BleepingComputer that the problem is attributable to an “unusually high volume of spam” originating from Microsoft’s servers, inflicting a mail delay.
“An unusually high volume of spam originating from the Microsoft email platform is causing temporary delays in receiving emails from that platform,” an AT&T spokesperson advised BleepingComputer.
“This incoming spam is an industry-wide issue that affects multiple email services. We thank our customers for their patience as we work with Microsoft to help protect them from fraud.”
BleepingComputer tried to be taught extra about this spam marketing campaign however didn’t obtain a response from Microsoft or Gmail, nor was there additional info from AT&T by the point of this publication.
Microsoft just lately introduced it can battle spam originating from its platform by imposing a every day Trade On-line bulk e-mail restrict of two,000 exterior recipients beginning January 2025.
Google additionally launched stricter spam thresholds and authentication necessities for bulk e-mail senders on April 1st to strengthen defenses towards spam and phishing assaults.
