On 2018-11-19 17:26, Matt Schwartz wrote:
So, I've come across an interesting error with OpenSMTPD 6.4.0. I tried sending an email to a virtual user whom I know does not exist on my system. The user is [email protected]. Instead of an error indicating that the user does not exist, I get the following NDR error: 524 5.2.4 Mailing list expansion problem. My virtual users are stored in a file called virtuals.
I ran into this as well and was seeing outbound backscatter for spam to non-existent virtuals. One solution is generating a separate file with a list of valid addresses based on the virtual entries, and using a mailaddr table with rcpt-to so they error with 550 at SMTP-time:
match from any for domain <vdomains> rcpt-to <addrs> action ... Not sure if there's a better way to accomplish this though. -Mark -- You received this mail because you are subscribed to [email protected] To unsubscribe, send a mail to: [email protected]
