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  • Congratulations Chriss Miller on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

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  1. bluegroper

    Need to Understand the real differences

    Did you read this thread ? https://www.tek-tips.com/viewthread.cfm?qid=1789128 It might help you understand the differences and nuances.
  2. bluegroper

    Blocking Emails from Amazonses service in Postfix

    I've solved similar problem using header_checks 1. Edit your /etc/postfix/main.cf Include something like header_checks = pcre:/etc/postfix/header_checks.pcre NB. Must reload postfix after editing /etc/postfix/main.cf 2. Edit your /etc/postfix/header_checks.pcre The format can be as...
  3. bluegroper

    Howto block email from Mailchimp

    Now that the MailChimp problem has been solved, we're moved on. Since we don't want to receive any emails from correspondents in Russia or Ukraine, the following lines in header_checks.pcre are stopping a quantity of spam being processed by our email server. /^From:.*\.ru>?$/i REJECT...
  4. bluegroper

    Howto block email from Mailchimp

    Well, after using a nice file of header_checks for a coupla weeks, We're getting this job done. Many lines in header_checks.pcre like this one : /^From:.*@linkedin\.com/i REJECT SPAM is rejected. Sender address is blacklisted. For the most persistent spammers, our perimeter firewall now...
  5. bluegroper

    Howto block email from Mailchimp

    For the moment we're staying within postfix, since I have little experience with SA. Also, I like giving the unwanted sender/s a specially crafted REJECT message which is intended to cause them confusion. It appears to work. There's some good and relevant info at the bottom of this page...
  6. bluegroper

    Regex to block spoof in Header Checks

    We use a different technique to reject emails spoofing our domain/s. Greylisting. It is very successful. On CentOS the package is postgrey. Simply, many spammers make up random usernames, and typically only make a single attempt to deliver their payloads. So those emails are never accepted by...
  7. bluegroper

    Howto block email from Mailchimp

    Yes, I've been contemplating something similar. Create an email folder/file called "Blocked". Move emails to the Blocked folder/file as desired. Nightly script to parse the users' Blocked emails and update the postfix header_checks file as needed to include REJECT. Since we only use webmail, and...
  8. bluegroper

    Server hacked

    This is another good thread for postifx on CentOS. https://wiki.centos.org/HowTos/postfix See especially the part/s about ensuring you're not an open relay. HTH
  9. bluegroper

    Howto block email from Mailchimp

    Chris, thanks for your reply. Perhaps "obfiscated" is a better description for Mailchimp's smptd FROM headers. Meanwhile, I'm redefining our problem, and hoping to stay within the postfix framework to achieve a satisfactory rejection outcome. We have a manageable number of senders who (despite...
  10. bluegroper

    Howto block email from Mailchimp

    Sadly, it seems the smptd_recipient_restrictions are not sufficient to block selected junk spewing out from Mailchimp's servers. I'm not surprised, since Mailchimp has significant resources to ensure their messages are not easily blocked. From the mail logs, it looks like Mailchimp is forging...
  11. bluegroper

    Howto block email from Mailchimp

    Chris I've blown a few years of dust off some good old texts. Postfix (2001) by Richard Blum ; and The Book of Postfix (2005) by Ralf Hildenbrandt and Patrick Koetter Yes, I have some dead-tree versions in my library. Also...
  12. bluegroper

    Howto block email from Mailchimp

    Chris Thanks for the great explanation. I couldn't find that anywhere else. I give you a star. I agree its easy, almost obvious, when you know how/why. I'm not a complete idiot. There's still a few pieces missing.
  13. bluegroper

    Howto block email from Mailchimp

    [SOLVED] Looks like my PBKAC smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access I had incorrectly included the above instruction within section smptd_sender_restrictions = Now moved to section smptd_recipient_restrictions = and appears working as intended. This...
  14. bluegroper

    Howto block email from Mailchimp

    Hi forum We like and have been using Postfix in our small business for many years. We have a small~ish list of sender domains that we reject using the usual details in /etc/postfix/sender_access and the following line in /etc/postfix/main.cf smtpd_sender_restrictions = check_sender_access...
  15. bluegroper

    Admin tools

    webmin can sometimes be helpful
  16. bluegroper

    Upgrade postfix

    Apply the usual CentOS updates # yum update HTH
  17. bluegroper

    Connect to SQL Server

    [DB Name] is the solution.
  18. bluegroper

    Connect to SQL Server

    Thanks feherke for suggestions. Unfortunately, all those options throw errors, but your input is greatly appreciated. Thanks rharsh for suggestion. Yo the man. It works. BTW, I'm connecting to an an old SQL Server 2005 Express database.
  19. bluegroper

    Connect to SQL Server

    Hi forum Newbie here, so please be gentle. I'm trying to connect to an SQL Server using Perl (of course). Works fine IF my SQL database name is SINGLE word. I'd like to also connect to database name which includes space. But rather than rename the database, I'm sure there's a better way to write...
  20. bluegroper

    ALTER TABLE

    using pg 7.4.19 Thx for clues. I shall do it the "long" way.

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