Sending an email using the .NET built-in SmtpClient object gives the following error:
System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Your IP address xxx was rejected by the Realtime Block List provider zen.spamhaus.org,Please contact your system administrator.
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception)
Spamhaus: An international non-profit organization whose main mission is to track spam gangs on the international Internet, provide a reliable real-time anti-spam protection network, assist law enforcement agencies in identifying and tracking spam around the world, and lobby governments to enact effective anti-spam laws.
Founded in 1998 and headquartered in Geneva, Switzerland, and London, England, Spamhaus has 25 investigators and experts in different teams in nine countries.
Spamhaus has published a list of registered well-known spam businesses (ROKSO) - a list of the 200 worst spam gangs in the world based on data and evidence collected in the database. To avoid these known spammers abusing their networks. At the same time, Spamhaus assists law enforcement agencies in tracking and reporting professional spam.
Spamhaus publishes a large database of spam organizations, including SBL, XBL, PBL. It has spread to 40 DNS servers in 17 countries through the international Internet. Spamhaus' blocklist is widely used by Internet network operators, companies, schools, governments, and military networks.
Spamhaus is funded by sponsorships and donations. Through international infrastructure investment and management, services provided by a separate logistics organization, developed using spam filtering technology, including synchronization services of spam organization lists to a wide range of online and commercial spam filtering agencies.
Check if your IP is on the blocklist:The hyperlink login is visible.
Scroll to the bottom and click Next to request removal, as shown below:
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Posted on 7/27/2021 5:50:29 PM
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Posted on 7/27/2021 9:21:54 PM
