Outbound error codes

Understanding Email Transfer Error Responses

This page lists and tries to explain errors you may have received while attempting to send messages using our service. Some errors also provide tips for you to remediate the issue. The SMTP response you received contains a unique code starting with OXSEU_. Find the code below to explain the issue you are experiencing and find remediation tips.

_101

550 5.7.1 Connection refused

Vade Managed Service platform protects its users by maintaining good outbound IP reputation. We could not accept your email because your IP is listed on the Vade Threat Network list. If you think this blocking is not justified you can fill out an abuse request

This list contains IP addresses which have been identified as sending spam.

_102

550 5.7.1 Connection refused

Vade Managed Service platform protects its users by maintaining good outbound IP reputation. We could not accept your email because your IP is blacklisted. You may try sending again later.

_110

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, a maximum amount of simultaneous connections is enforced. Reduce the amount of simultaneous connections and try sending again.

_130

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. Your IP address has exceeded the tresholds in place to mitigate outbound spam. You may try sending again later.

_134

421 4.2.1 Connection refused

To protect Vade Managed Service platform users, a maximum amount of authentication failures is enforced. Your IP address has exceeded the maximum amount of authentication failures. Double check your username and password and try sending again later.

_136

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, a maximum amount of emails sent is enforced. Your IP address has exceeded the maximum amount of sent emails in alloted time. You may try sending again later.

_139

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, a maximum amount of connections is enforced. Your IP address has exceeded the maximum amount of connections in alloted time. You may try sending again later.

_200

550 5.7.1 Authentication Refused

To protect Vade Managed Service platform users, available authentication methods are limited. The authenticatation method used is currently not available. Double check your username and password and try sending again later.

_201

550 5.7.1 Connection refused

To protect Vade Managed Service platform users internet standards are followed. Refer to RFC5321. The host referenced in the HELO command is blacklisted due to past behaviour.

_202

550 5.7.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, a fair use policy is enforced. The username used to authenticate is currently blacklisted, contact your account provider for clarification.

_206

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. The authenticated username has exceeded the tresholds in place to mitigate outbound spam. You may try sending again later.

_207

550 5.7.1 Authentication Refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. Authentication of the provided username could not be performed. Please double check and use a valid FROM address when sending.

_208

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. You may try sending again later.

_301

550 5.7.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. The Mail From provided in the message is formatted incorrectly. Double check the Mail From and try sending again later.

_303

550 5.7.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. The domain name in the Mail From provided is invalid. Double check the Domain Name in the Mail From and try sending again later.

_305

421 4.2.1 Connection deferred

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the amount of emails. The maximum amount of sent messages per session has been reached. Disconnect and try sending again later.

_306

550 5.7.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. The Mail From provided is blacklisted. Contact your account provider for clarification.

_307

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. Your Mail From has exceeded the tresholds in place to mitigate outbound spam. You may try sending again later.

_308

550 5.5.1 Authentication Required

To protect Vade Managed Service platform users, available authentication methods are limited. Authentication was not provided for your connection. Please double check username and password and try sending again later.

_309

550 5.7.1 User not allowed to send

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. Sending of emails for provided username is disabled, contact your account provider for clarification.

_402

550 5.7.1 Connection refused

To protect Vade Managed Service platform users tresholds has been set for the quality of emails. The recipient of this message has been blacklisted.

_404

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. The maximum ammount of recipients per message per IP has been exceeded. You may try sending again later.

_405

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. The maximum ammount of recipients per message has been exceeded. You may try sending again later after reducing the amount of recipients.

_406

501 5.7.1 Connection refused

To protect Vade Managed Service platform users tresholds has been set for the quality of emails. The Recipient To Address provided in the message is formatted incorrectly and can't be routed in internet. Double check the recipient address and try sending again later.

_407

501 5.7.1 Recipient rejected

Vade Managed Service platform was unable to deliver to the domain provided in the Recipient To Address. Double check the recipient domain and try sending again later.

_502

550 5.7.1 Connection refused

To protect Vade Managed Service platform users tresholds has been set for the quality of emails. The recipient of this message has been blacklisted.

_503

550 5.7.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. The provided From address Header is empty. Double check the From Address Header and try sending again later.

_507

451 4.3.0 Message temporarily rejected

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the quality of emails. The message can be sent again later.

_510

552 5.3.4 Message size limit exceeded

To protect Vade Managed Service platform users and ensure outbound sending performance, tresholds has been set for the maximum size of emails. The maximum message size has been exceeded. Reduce message size and try sending again later.

_511

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. The number of messages sent exceeds the maximum set within the allotted time. You may try sending again later.

_513

550 5.7.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. Based on the reputation the from domain has been blacklisted. You may try sending again later.

_514

554 5.6.0 Too many hops

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. We have stopped resending your email as it has been resent (looping) more than the specified threshold value. This is to prevent infinite loops in emails.

_539

421 4.2.1 Connection refused

To protect Vade Managed Service platform users and ensure outbound sending performance, fair use policy is enforced. Too many connections are opened from your IP within the allotted time. You may try sending again later.