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• What exactly is a X-YMailISG header?

  - by iainH

  Finally ... our emails are being seen by Yahoo! not as junk anymore. Hurray! However I notice that the Yahoo! receiving MTA adds in a X-YMailISG header. It's very large ... 2**10 bits? Now that I've invested too large a chunk of my waking life in crafting our email headers I'm curious to know what an X-YMailISG header is. Can anybody tell me? Does it pose any security / authenticity issues? There's very little intelligible from Google results. Background: After many days tweaking TXT records in our domain's DNS zone file for SPF and DKIM, I have at last succeeded in generating email from our Drupal site that Yahoo! no longer marks as X-YahooFilteredBulk and the excellent service [email protected] returns results that show the emails passing SPF, DKIM and Sender-ID checks and appearing to SpamAssassin as ham. Yahoo! even adds a Received-SPF: pass header. Useful links: http://www.goldfisch.at/knowwiki/howtos/dkim-filter http://old.openspf.org/wizard.html Strangely enough the SPF TXT record needed / allowed a blank key / name field in our registrar's DNS management panel whereas the DKIM record needed the {selector}._domainkey as the key /name of the DKIM strings.

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• How do I override apt-get removing dependent packages?

  - by iainH

  I want to replace postfix with exim4 on my Ubuntu test server to reflect the setup I have on my production server, but apt-get and aptitude (quite understandably) insist on removing several packages that depend upon having a mail stack. However, in this case I am prepared to override apt-get's undoubted good sense as exim should fulfil all the requirements of the dependent packages, providing mail and sendmail functionality for my applications. I don't want to remove the dependent packages as there is months of effort invested and, although backed up, will be a pain to reconstruct properly.

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