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Questions tagged [email-bounces]

email bounces are messages that are delivered to the nominated postmaster account on an email server to indicate a problem delivering the mail to one or more recipients.

email bounces are messages that are delivered to the nominated postmaster account on an email server to indicate a problem delivering the mail to one or more recipients.

Bounces can result from unknown users, failed mail servers, or other network or configuration issues.

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Why does reject_null_sender in iredmail rejects valid bounces?

The reject_null_sender plugin in iRedMail indicates its purpose as: Reject message submitted by sasl authenticated user but specifying null sender in 'From:' header (from=<> in Postfix log). But the code actually states a rejection when either the…
manu
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Sender IP in blacklist

When we send mails to AOL accounts, they are rejected and bounce back. After checking our IP on blacklists, there seems to be two lists on which our IP appears blacklisted. This comes as a surprise to us as we never spam and only mail our clients…
dr_rk
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Outbound SMTP email not being delivered, but still disappearing from the queue and pickup folder

After setting up my smtp server on a Windows 2012 server r2 on port 587. I tested the email functions by creating a text file labeled email with the following code inside: From:admin@mydomain.com to:otheremail@gmail.com Sunject: Test Email This is…
user3771570
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Do spam impersonators impact my server's reputation?

Recently I opened my server's webmaster email inbox and found 32 "Delivery status notification failed" emails reporting the failure of the delivery of 32 emails I did not send. After some investigation I have determined that several IP addresses are…
starbeamrainbowlabs
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Need advice on integrating mail server with a smallish social network?

I have been given a task to setup email management and delivery for a smallish social network. We're currently sending out about 1000 emails per day with help of VerticalResponse (a bulk emailing company). But for flexiblility reasons and to save…
Arpit Tambi
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Possible to setup a secondary email server with unique addresses?

It is possible to setup two email gateways such that if a record doesn't match the first server then it attempts a second server before failing to deliver? Background: Client recently switched from in-house servers to Office 365. There was an email…
Twitch
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How would get an email server reputation via cli or script?

I am trying to monitor email server reputation via cli or script i.e. https://www.senderbase.org/ I found a way supposedly to do it via dig, but the output appears to be very incorrect. It indicates I am PRUDENTIAL in US and that server is in Japan.…
nix
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550 sender rejected - sender domain has no MX/A record. Different IP for MX & A Records

I have a website that has different hosting for website and email. I host the website and another company hosts the email and handle the domain. This is how the domain is set up: (The domain name & IP are masked for privacy purpose) Record …
syanaputra
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Mailserver creating mail accounts upon "User unknown in virtual mailbox table" on local delivery

I'm running an older Postfix and Courier mailserver with virtual domains. I recently experienced that local delivery (using webmail) to a not existing mailbox would result in that actual mailbox to be created - like /var/vmail/domain/notexistinguser…
SteffenNielsen
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Mailbox Full bounce for an Exchange Distribution List

This is neat. Just got this in a shared Exchange 2003 mailbox: Your message did not reach some or all of the intended recipients. Subject: [real subject replaced] Sent: 9/16/2009 1:35 PM The following recipient(s) could not be…
squillman
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Sending bulk / single emails from a single domain

Let me explain our situation: We have a web application that uses subdomains for each customer instance: customer1.example.com customer2.example.com Every instance can have over 500 users, which all have entered their own email address. We send…
Basaa
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Make postfix not send bounce emails when rejected by Cluebringer (policyd v2)

I have recipient throttling (quotas) enabled on cluebringer and it's working well. However, every time someone is being throttled, postfix sends back a bounce mail. I do not want it to send back a bounce mail if an email has been rejected by…
Manu
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How to redeliver 'Undelivered Mail Returned to Sender' in /var/spool/mail?

After changing the IP of a server that was configured as a satellite email system I missed to update mynetworks on the mail server to allow the sending of emails on behalf of the new IP address. That's why lots of emails were written to…
Florian Sager
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Receiving mail in a python process on an aws instance

I'm using a Python smptd server on an AWS instance. It's listening on localhost, port 25. I can send mail to it through a Python smtp client on the same instance. I have an elastic IP associated with the instance. I'm calling that IP address…
user76542
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how to discourage email spoofing

One of my production server emails look like to be spoofed from another network. The team (group or individual or professional company) is sending mass mails out to their list of users, using our email addresses. And, I am receiving a lot of fail…
Bimal Poudel
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