[SBCGlobal Support Number]

SBCGlobal Error Code 550 is caused when a user tries to send an email to an unverified address. You can follow the instructions below to fix the “Mailbox unavailable” issue:
Step 1: Log in to your SBCGlobal email account and click on the ‘Settings.’
Step 2: Select ‘More Settings’ and then go to the ‘Mailboxes’ section.
Step 3: Go to “Send-only Email Address” and click on the ‘Add’ option.
Step 4: Enter the account information and then press the verify button.
Step 5: Check the email account that you want to verify and follow the steps.
Step 6: Navigate back to the mailboxes page and click refresh.
In case you cannot complete the verification process you can call the SBCGlobal support and ask for help.
Read More: - SBCGlobal Customer Support Phone Number | SBCGlobal Customer Service