Southwestern Bell Telephone Company earlier started SBCGlobal email, but later it was merged with AT&T email services. Any email is not bug-free, so SBCGlobal email is also troubled with many errors, and one common error is 550. Read out some troubleshooting steps to fix this error.
● Enter valid email recipient
● Repair blocked authentication
● Verify sender’s valid email address
After following the above troubleshooting methods, you must call the SBCGlobal Customer Service Number to resolve error 550 in the SBCGlobal email, and a technical executive is available all the time to receive your calls 24/7 hours. You will get the necessary solutions instantly.