[pfx] Re: gmail failing SPF/DKIM
Hello. I was able to replicate this error, however it's not a misconfiguration in Postfix, but rather a policy change by Google. I didn't notice the bounce message sooner, since it was routed to my SPAM folder on Gmail. If I use a GMAIL From: address and attempt to email another GMAIL account, it bounces back with this error. Only, when I use a third-party to relay the message. I think what is happening is that Google has implemented a new anti-spam policy, rejecting any emails that have GMAIL email hosted domain that is failing SPF/DKIM. Only messages relayed via Google are valid. If you are using a contact form, the From: address is typically munged to be the user filling out the form. -- Forwarded message -- From: Matthew McGehrin To: Matthew McGehrin Cc: Bcc: Date: Tue, 28 Nov 2023 20:25:24 -0600 Subject: Testing to Gmail Test : host gmail-smtp-in.l.google.com[142.251.167.27] said: 550-5.7.26 This mail has been blocked because the sender is unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM. 550-5.7.26 550-5.7.26 Thank you. Matthew ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[pfx] Re: smtpd rate limiting
I might had used the wrong terminology. I was mainly referencing delayed email that occurs with Grey listing. Most of the delay email for me is either Google or Yahoo. Matthew On 9/29/2023 7:40 PM, Wietse Venema via Postfix-users wrote: Matthew McGehrin via Postfix-users: Hi Kevin. If the delays are being caused by bounce message processing, you could Then you should configre Postfix to block undeliverable mail. - Don't accept mail for non-existent recipients. - Don't forward SPAM to other systems. Wietse ___ Postfix-users mailing list --postfix-users@postfix.org To unsubscribe send an email topostfix-users-le...@postfix.org___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[pfx] Re: smtpd rate limiting
Hi Kevin. If the delays are being caused by bounce message processing, you could run a second instance dedicated to just processing delayed messages using fallback_relay. You can also make adjustments to the individual queues in master.cf, one tweak I use is increasing the flush rate to 1800. IE: flush unix n - n 1800? 0 flush Thank you. Matthew On 9/29/2023 9:34 AM, Wietse Venema via Postfix-users wrote: Wietse Venema via Postfix-users: Kevin Cousin via Postfix-users: Greetings List, We recently had an issue and the active queue was full and slowed down all new mail delivery. Is it possible to rate limit the mail flow to protect smtpd from a massive mail input ?t as increasing the in_flow_delay. Can you answer one question: is mail arriving too fast, or are deliveries too slow? If the problem is the latter, then your queue may be full of MAILER-DAEMON messages. ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[pfx] Re: Anyone using SMTP relay through dnsexit.com?
Hello. Some alternatives might be to use one of the commercial bulk mail providers such as: Sendgrid AmazonSES MailGun I use mailersend.com for transactional emails for Reverse.net. Other options include buying a $5 KVM and self hosting a public relay for outbound only. Matthew On 6/27/2023 10:01 AM, John Stoffel via Postfix-users wrote: I've got sorta the same issue, but it's more that Spectrum (charter) is not allowing any emails from my personal domain hosted on Linode to send email to their customers. Guess who runs cable in my town? Sigh... so I too am looking for solutions. ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[pfx] Re: delivery loop?
Hello. It really depends on your mail volume and the reliability of your primary MX hostname. Typically the RFC permits mail to be delayed for up to 5 days at which mail will bounce back as undeliverable. For most low-volume sites, a primary only MX configuration is fine. Both of those domains have either Round-Robin DNS or multiple MX servers which provide a similar function. outlook.com mail is handled by 5 outlook-com.olc.protection.outlook.com. outlook-com.olc.protection.outlook.com has address 104.47.14.33 outlook-com.olc.protection.outlook.com has address 104.47.13.33 Yahoo has multiple server weight 1 servers providing redunancy. yahoo.com mail is handled by 1 mta6.am0.yahoodns.net. yahoo.com mail is handled by 1 mta5.am0.yahoodns.net. yahoo.com mail is handled by 1 mta7.am0.yahoodns.net Thanks Matthew On 5/22/2023 6:53 PM, Tom Reed via Postfix-users wrote: PS: Why do you (think you) need a backup MX? Hello I am not sure why I need a backup mx indeed, but if you make a simple dig, you find gmail, fastmail, protonmail, comcast, free.fr those big providers do have backup MXs. Though yahoo, outlook don't have backup MX as a comparison.___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[pfx] Re: Painful Postfix
Hello. You can try adding to your main.conf: tcp_windowsize=65535 See also: https://www.postfix.org/postconf.5.html That can help fixing broken window sizes because of a firewall. Thanks Matthew On 4/30/2023 12:35 AM, Kolusion K via Postfix-users wrote: Hello again My e-mail server is able to deliver e-mail to some hosts but will time out when attempting to deliver to other hosts. What could be causing this problem? Thanks Sincerely, Kolusion ___ Postfix-users mailing list --postfix-users@postfix.org To unsubscribe send an email topostfix-users-le...@postfix.org___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[pfx] Re: Painful Postfix
Hello. Could you post a copy of the logs that you are seeing for this mail delay? What was the reject code? Thanks Matthew On 4/29/2023 5:40 AM, Kolusion K via Postfix-users wrote: Hello I am having a painful experience with Postfix and I hope that someone can help me. I am trying to send an e-mail, but the receving e-mail server is timing out, as per Postfix's mail log file. ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[P-U] Re: New List Host and Reply-to Header
Hi Peter. The Reply-To has always been the original poster for 10+ years. No sense changing it now. :) Matthew On 3/9/2023 1:08 PM, Peter via Postfix-users wrote: On 10/03/23 07:34, postfix--- via Postfix-users wrote: Is it the best idea to add a reply-to header to the author on mailing list emails? The problem I see is many people will hit reply in their email client which will create an email from them to the author, bypassing the mailing list. Unless they remember to manually alter the To: field to keep the conversation on the list, it wont be. Many email clients have a "Reply List" option which goes to the address in the List-Post: header. Thunderbird has a "Smart Reply" button that when displaying a message with List-Post: defaults to "Reply List". I've found that hiding the normal reply button in TB and enabling the smart reply button has made my world way easier when dealing with mailing lists. ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[P-U] Re: Poster Name not visible in Thunderbird
Hello. I found the issue. It seems I had the list address saved as a contact, so Thunderbird was displaying Postfix Users. I removed the contact and it's displaying the poster name. See screenshot. Thank you. MatthewM ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
[P-U] Poster Name not visible in Thunderbird
Hello. Sadly, when viewing this list in Thunderbird, it only displays "Postfix Users" as the From address, versus showing the posters name. I tend to ignore posters I don't recognize, and now i need to open each post to see who replied. Any workarounds in Thunderbird to override this behavior? Thank you. MatthewM ___ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
