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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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Is it possible to change MX records without downtime/returning/dropping messages?

We're migrating e-mail hosting from SERVER-A (on HOSTING_CO-A) to SERVER-B (on HOSTING_CO-B). SERVER-A will continue to be functional until the transition is complete and HOSTING_CO-A has their own DNS server since our records currently show…
user3645994
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How to forward anything@subdomain.domain.com to anything@domain.com

Scenario Our company has two web servers. Our main doman, domain.com is hosted offsite using a hosting provider (In this case, Netfirms). One of our subdomains, subdomain.domain.com is hosted onsite and is reached via a CNAME entry in the DNS…
Sirach Matthews
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Disable the sending of "Undeliverable Mail Returned to Sender" in Postfix

I have searched for this question already and found this question but the basic question was never answered. How do I completely disable Postfix from sending undeliverable notifications? I want to do this temporarily because we are in the process of…
bistromath
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Mailgun emails are rejected everywhere but on Gmail

My problem and Mailgun logs I've "setup and verified" (see context) my sending domain with Mailgun, so I could use it to deliver my contact/order forms via Mailgun API: https://github.com/mailgun/mailgun-php After successful verification (according…
Petr Cibulka
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Delivery Status Notification (Failure) => 550 SPF: x.x.x.x (IP address) is not allowed to send mail from

Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain by . [192.185.87.85]. The error that the other server returned…
gvasquez
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disabling postfix "Undelivered Mail Returned to Sender"

Is it possible to disable the postfix notification "Undelivered Mail Returned to Sender"? Since I receive too much spam with forged senders, I don't want postfix to notify these forged senders.
jbastos
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Dynamically limit postfix attachment size

For a project I am currently working on, we received a requirement for a 'dynamic' mail attachment size limit. For postfix (which we currently use) this would be easily implemented using the message_size_limit configuration option. This however…
marabunta2048
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SMTPD restrictions

I'm looking for a bit of advice on Postfix restrictions configuration. I'm looking for a balanced configuration which properly rejects spam and unauthorized access retries. Lately, I've been reading some docs and trying to learn from other's…
peris
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Postfix: Reject reject_unknown_recipient_domain and receive instant email notification

when an email is sent to a non existing domain or recipient, i would like the sender to receive an immediate email from mailer-daemon informing the recipient does not exists. Actually, what happens on my system is the email gets in the deferred…
peris
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Postfix: Resend 'hard' bounces

I had a number of messages get rejected by the recipient's mail server with a status 550 code due to an IP address blacklist. I've sorted the problem that caused the host to become blacklisted, and removed the entry from the blacklist. I'd like…
aroth
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MTA handling of too large emails

If an MTA receives an email that exceeds the message size limit, which bevaviour is preferred? What is the default for common mail servers? Reject the email during the SMTP session. The delivering MTA must send a bounce message to the original…
chriddy
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Exchange 2010 "Cannot send on behalf of user"

I am getting a bounceback when sending an email from another account, the error is "You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the…
Dan
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Having trouble interpreting mail log DNS errors

I have a postfix mail server on Debian. A client of mine just informed me that they were unable to send an email to me and it appears that there is a problem with their mail server. I would like to get back to them with the actual problem, but I'm…
Mike
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Exchange 2010 Mail Contacts get assigned internal SMTP addresses by the recipient policy

This environment has been upgraded from Exchange 2007 to a new Exchange 2010 server. There are several thousand email contacts that reside under the Federation_Contacts OU. Under the Email Addresses tab for each Mail Contact, their correct SMTP…
Zero Subnet
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Postfix deferred email - How to expire so bounce-back email gets sent back

My hosted email server is "Refusing to talk : 550" with my postfix server. Gmail, Yahoo, Hotmail all accepts them fine. All of sudden hosted email provider decided not accept email from my server. I dont really know why... i dont send out spam nor…
WJR
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