# Common errors

- [Connection errors](/email-warmup/common-errors/connection-errors.md)
- [Google SMTP error](/email-warmup/common-errors/connection-errors/gmail-smtp-errors.md)
- [Errors with port 25](/email-warmup/common-errors/connection-errors/errors-with-port-25.md)
- [Help fixing connection issues](/email-warmup/common-errors/connection-errors/help-connection-issues.md)