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1. Characters in the local part of a mail address
   RFC2821 and RFC2822 state clearly that only 7bit ASCII characters are allowed in Internet mail addresses. The following list shows all the ASCII characters and explains whether they can or should be allowed in the local part of a mail address.
   04-05-2011 to char, mail, mailto, rfc, rfc2821, rfc2822, smtp and -1 others
2. Mailserver%20encryption%20test%20(STARTTLS%2C%20TLS%20and%20PFS)%20%C2%B7%20SSL-Tools
   STARTTLS test for secure SMTP settings
   14-11-2016 to dane, email, mail, online, pfs, security, server, service, smtp, starttls, tls and -1 others
3. SPF Query Tool
   Several SFP mail and DNS tools
   29-03-2017 to dns, email, online, service, smtp, spam, spf and -1 others
4. Test Smtp
   Online Testseite um zu checken ob ein Mailserver als Relay agiert
   14-12-2010 to mail, online, relay, service, smtp, test and -1 others
5. Web-Based Email/SMTP Test Utility (ZoneEdit.com)
   SMTP Testutility - Webinterface
   12-05-2010 to deliver, mail, online, service, smtp, test and -1 others
6. Why you shouldn't jump on the SPF bandwagon
   Why SPF is not the best way to fight spam
   04-04-2013 to mail, security, smtp, spam, spf, srs and -1 others

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