ImprovMX
ImprovMX is an email forwarding service that lets you receive emails in your custom domain and forward them to your personal address.
Codes
- 450↑
450 4.2.1 Please try again later. (#id-5.9.4)
Their anti-spam check failed. We need the sender to retry sending.
- 550↑
550 5.7.1 Message considered as SPAM
Your email scored above the spam threshold and was rejected. Revise your email for any unwanted content prior to resending.
- 550 5.1.1 The email account you tried to reach does not exist. Please double-check the recipient's email address for typos or unnecessary spaces.
550 5.1.3 Relay not permitted. (#id-5.9.2)
The domain was not found in their system, or was not added correctly, so they can't route emails.
- 551↑
551 5.7.1 Due to the very low reputation of the sending domain, this message has been blocked (Code 2).
Your domain is on a reputation blacklist such as the Spamhaus DBL. You will need to be delisted before you can send emails.
551 5.7.1 Loop detected: Email is sent and forwarded from/to improvmx.com. (#id-5.9.0)
The destination mailbox loops back to ImprovMX. They block these messages in order to avoid loops.
551 5.7.1 Domain not found (#id-5.9.2)
The domain was not found in the ImprovMX database.
- 551 5.7.1 Our database returned invalid pieces of information about the requested recipient’s domain (#id-5.9.3)
- 551 5.7.1 Unable to correctly read the forwarding recipient (where to forward the email to) (#id-5.9.5)