Common email bounces & errors¶
Use this page to troubleshoot common email bounces & errors. Save the full error message, bounceback, headers, or mailbox details before contacting Fused support.
User-fixable email errors¶
These specific messages below are technically user sortable, that is, you can likely fix them without our involvement. Don't hesitate to involve us if any frustration is arising though, we're happy to help!
Note
When reaching out to us, we'll either request a copy of the error/bounce message, or the headers. You can learn how to retrieve headers at viewing the full headers of an email.
550 No Such User Here¶
This error is generated due to the recipient's email address not existing. Check your to/cc/bcc fields for a mistyped email address, and try sending again.
If it continues to fail, forward us the bounce message & we'll provide instructions.
Mailbox Full¶
Receive mailbox full, or quota reached message? If this is an email account hosted on your account, you can adjust its quota. If it's someone else's email account, you'll need to find another way to reach them as their account is full.
Failure Reason: Error: No Such Domain¶
This could be the result of a mistyped domain in your recipients list. Double-check your spelling and attempt to send your email again.
Delivery to the following recipients failed permanently¶
Check the bounce message for typos in the email address, if there are none, it could likely mean that the recipient's domain is misconfigured or no longer exists.
Forward the bounce message to us & we'll provide instructions.
x.x.x.x is not allowed to send mail from example.com¶
This is likely due to your SPF record needing adjusted. Forward us the bounce message you got in return & we can investigate.
Email bounces Fused can assist with¶
The account or domain may not exist, they may be blacklisted, or missing the proper dns entries¶
This could get complex, send us the full email headers.
You can learn how to retrieve those at viewing the full headers of an email.
550 Sender IP reverse lookup rejected¶
This could get complex, send us the full email headers.
You can learn how to retrieve those at viewing the full headers of an email.
MailChannels or outbound filtering rejection¶
Fused uses MailChannels for outbound mail filtering. If a bounce mentions
MailChannels, 550 5.7.1 [...], sender blocking, message blocking, complaints,
or outbound reputation, save the full bounce and send it to Fused support.
Failure Reason: Error: 554 Denied¶
This is likely due to the recipient server blocking your message for spam filtering reasons. We'll do our best to help, forward us the full headers.
You can learn how to retrieve those at viewing the full headers of an email.
Exploits Block List (XBL)¶
This is due to another user (or yourself) on the system doing nefarious things. Send us the bounce message & we'll investigate.
Poor reputation or blocklist message¶
This is likely due to an outbound reputation or recipient filtering issue. Forward the bounce message to Fused support.
Delivery to the following recipients failed permanently¶
This infers that something is wrong on the recipients side, but we'll need more information to investigate.
Forward us the full headers. You can learn how to retrieve those at viewing the full headers of an email.
550 Sender IP reverse lookup rejected¶
Forward us the bounce message and we'll investigate.