15 seconds? Postfix out-of-the-box waits no more than 9 seconds for the very probe to succeed. Perhaps you have been changing Postfix parameters. Please follow instructions as requested in the mailing list welcome message.
Sorry, my bad, I had the address_verify_poll_delay set to 15 seconds, which I tought it applies in-progress verification only, not completed ones.
Then, is there a way to keep alive the client connection for a maximum of 15 seconds till verification is in progress, reply asap positively or negatively when verification is done (with success or failure), or reply with 4xx when 15 secs elapsed and verification couldn't complete due to temporary error?
smime.p7s
Description: S/MIME Cryptographic Signature
