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When does postfix reject an address for any reason?
Thus, Postfix rejects an address when a preferred MTA for that address rejects mail from your machine for any reason. This is not a limitation, but it is mentioned here just in case people believe that it is a limitation.
When does postfix assume an address is undeliverable?
Postfix assumes that an address is undeliverable when a preferred MTA for the address rejects the probe, regardless of the reason for rejection (client rejected, HELO rejected, MAIL FROM rejected, etc.). Thus, Postfix rejects an address when a preferred MTA for that address rejects mail from your machine for any reason.
When to use non-zero address verification in postfix?
Although Postfix always discards mail to the double-bounce address, this still results in wasted network bandwidth and server capacity. To defeat address harvesting, Postfix 2.9 and later support time-dependent sender addresses when you specify a non-zero address_verify_sender_ttl value.
How does postfix work when verifying a remote address?
When verifying a remote address, Postfix probes the preferred MTAs for that address, without actually delivering mail. If a preferred MTA accepts the address, then Postfix assumes that the address is deliverable. In reality, mail for a remote address can bounce AFTER a preferred MTA accepts the recipient address,…
Can you block an email address in postfix?
A. By default, the Postfix SMTP server accepts any sender address. However you can block / blacklist sender email address easily with Postfix. It has SMTP server access table. Open /etc/postfix/sender_access file. # cd /etc/postfix. # vi sender_access. Append sender email id as follows:
Is there an address verification function for postfix?
Postfix address verification does not work with such sites. By default, Postfix probe messages have a sender address “double-bounce@$ myorigin ” (with Postfix versions before 2.5, the default is “postmaster@$ myorigin “). This is SAFE because the Postfix SMTP server does not reject mail for this address.
Why is reject _ unauth _ destination important in postfix?
The next line, reject_unauth_destination, is critically important as it tells postfix not to accept messages with recipients at domains that are not hosted locally or that we serve as a backup server for. Without this line, our server would be an open relay.
Why is my server rejecting the recipient address?
To avoid the email delivery in the spam box of remote servers I set up a SPF and DKIM following this tutorial. The problem now I have is my server is rejecting the recipient address on my server when delivered from remote services like Gmail.
What happens if a postfix recipient Verification fails?
If a recipient probe fails, then Postfix rejects mail for the recipient address. If a recipient probe succeeds, then Postfix accepts mail for the recipient address. However, recipient address verification probes can increase the load on down-stream MTAs when you’re being flooded by backscatter bounces,…