service-smtpTroubleshooting
Supports
- Analyze error codes for undelivered messages Understand SMTP error codes for undelivered messages in your Service-SMTP reports: wrong address, recipient server issues, SPF failures, and spam rejections.
- Option 1: Increase the time limit for connecting to the server Fix an Outlook message with a large attachment that keeps resending to recipients: raise the server connection time limit or compress the attached file.