Hello,
Are you getting the smtp error code 421 We have limits for how many messages can be sent per hour/day ?
There are several things to check on your mail server including :
Are you getting the smtp error code 421 We have limits for how many messages can be sent per hour/day ?
There are several things to check on your mail server including :
- Verify that none of your clients or accounts are compromised/spamming
- Verify that no one (sales, marketing) is sending emails that have spammy content
- Check the IP address of your mail server to see if it's on a blacklist
- New! Web site addresses (URL's) in email signatures could be a problem
- Do you have matching custom forward and reverse DNS?