Question
Why am I presented with a similar error to the following when attempting to send an email:
SMTP error from remote mail server after initial connection:
554 Blocked $IP_Address
Answer
This indicates that the remote server blocked the IP Address.
A few things that you can check are the following:
- Determine if the IP address mentioned has a valid PTR record. For reference, please see the following:
- Determine if the IP address is blacklisted on a public RBL.