Technical Details

Outbound IP Adresses

195.186.99.0/24
195.186.227.0/24
195.186.120.0/24
ip4:195.186.5.130
ip4:195.186.133.129
ip4:195.186.133.130
ip4:195.186.198.141
ip4:195.186.18.60
ip4:195.186.136.60
ip4:195.186.123.61
ip4:195.186.136.61

Error Codes

Identifier Error Code Reason
sc141 550 The destination address is unknown or already deleted by Bluewin. Please check the recipient addresse 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 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 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.
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 552 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](https://support.bluewin.ch/de/provider/delisting.
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](https://support.bluewin.ch/de/provider/delisting. 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](https://support.bluewin.ch/de/provider/delisting.
sc971 554 SPF hard fail
sc972 451 SPF soft fail