Technical Details

Outbound IP Adresses

195.186.227.0/24
195.186.120.0/24
195.186.5.130
195.186.133.129
195.186.133.130
195.186.198.141
195.186.18.60
195.186.136.60
195.186.123.61
195.186.136.61

Error Codes

ID
Code
Description
sc141
550
The destination address is unknown or already deleted by Bluewin. Please check the recipient addresses and try again.
sc151
452
A temporary error has occurred that does not allow the mail address to be validated. Please try again later.
sc171
452
The sender address is temporarily unavailable due to maintenance work. We apologize for the circumstances. Please try again later.
sc172 sc173 sc174
550
The sender address is currently disabled or locked. Please contact the hotline at 0800 800 800.
sc204 sc205 sc206 sc207 sc962
550/554
You have been blocked by an external blacklist. We use various external blacklists to ensure our service quality. If you find this to be an error, please contact the appropriate source of your error message directly.
sc771
451
A temporary send block has been triggered because your sending behavior shows signs of typical spam sending. If you feel this is an error, please contact the support of your mail service provider. If you are sending yourself, please use our contact form.
sc775
451
Your IP is listed on an internal blacklist. If you feel this is an error, please contact the support of your mail service provider. If you are sending yourself, please use our contact form.
sc821
501
There are incorrectly configured DNS entries in the sending infrastructure. Please check your settings and try again later.
sc822
421
Missing reverse DNS entries or your DNS server is currently not reachable. Check your reverse DNS entries or try again later.
sc823
501
Your mail server registers with an invalid name. Please check your server settings and try again later. For more detailed information, please refer to RFC 5321.
sc824
550
The MX record for your domain cannot be verified. Please check your DNS settings.
sc831
550
You have used an invalid sending domain. Please check your server settings.
sc832
550
You have tried to send your mails to a non-Swisscom address. Sending e-mails to foreign domains via our inbound servers is not permitted.
sc921
452
The maximum number of e-mails sent to our platform has been exceeded. This is a temporary block. Please try again later. If you feel this is an error, please contact your mail provider. If you are sending yourself, please use our contact form. Please note that your IP addresses will be judged by a reputation management. Therefore it is important to warm up new IP addresses first before sending large amounts of mail over them.
sc922
451
Your sent e-mail was temporarily rejected due to a bad IP reputation. The reason for this is that in the past a large part of your mails were classified as spam. If you feel this is an error, please contact your mail provider. If you are sending yourself, please use our contact form.
sc941
421
The maximal number of connections has been reached. Please try again later.
sc942
452
The batch limit has been reached. Please send in lower volumes and try again later.
sc943
452
The maximum number of recipients per connection has been reached. Please try again later.
sc944
452
The maximum number of recipients per message has been reached. Please reduce the number of recipients per message and try again later.
sc951
452
Your email was classified as a virus. If you find this to be an error, please contact our support via contact form.
sc952
451/452
Your message was classified as spam and therefore rejected. Please try again later. If you find this to be an error, please contact our support via contact form.
sc961 sc962
550
Your IP is listed on an internal blacklist. If you feel this is an error, please contact the support of your mail service provider. If you are sending yourself, please use our contact form.
sc963
450
Your sent email was temporarily rejected due to a bad IP reputation. The reason for this is that in the past a large part of your mails were classified as spam. If you feel this is an error, please contact your mail provider. If you are a provider, please use our contact form.
sc964
450/550
There are missing reverse DNS entries or your DNS server is currently not available. Check your reverse DNS entries or try again later.
sc965
450
The maximum number of e-mails sent to our platform has been exceeded. This is a temporary block. Please try again later. If you feel this is an error, please contact your mail provider. If you are sending yourself, please use our contact form. Please note that your IP addresses will be judged by a reputation management. Therefore it is important to warm up new IP addresses first before sending large amounts of mail over them.
sc966
450
The sender domain could not be verified. Either you have a misconfigured DNS server or the server is currently unavailable. Please check your settings and try again later.
sc968
550
Your message was classified as spam. If you find this to be an error, please contact our support via contact form.
sc969
550
Your message was rejected because you sent too many messages classified as spam in a certain period of time. If you find this to be an error, please contact our support via contact form.
sc971
554
SPF hard fail
sc972
451
SPF soft fail
sc973
450
The maximum number of e-mails sent to our platform has been exceeded. This is a temporary block. Please try again later. If you feel this is an error, please contact your mail provider. If you are sending yourself, please use our contact form. Please note that your IP addresses will be judged by a reputation management. Therefore it is important to warm up new IP addresses first before sending large amounts of mail over them.
sc42
450/550
The transmission of your message was rejected for internal policy reasons. If you consider this to be an error, please contact our support via the contact form.