I've recently purchased an updated copy of the ISPConfig 3 manual, however it does not include examples of white-listing random sub-domains. We have a situation where the content filter is blocking the LinkedIn signup automated verification emails. Here's an excerpt: Code: Jan 24 22:46:43 g1s2 postfix/smtpd[26615]: NOQUEUE: filter: RCPT from maila-de.linkedin.com[108.174.6.141]: <s-2kevknojoowsv5k7p9afyfukvm9yjzajhvrw7g32lhfcz2hfqfhwqcf5@bounce.linkedin.com>: Sender address triggers FILTER amavis:[127.0.0.1]:10026; from=<s-2kevknojoowsv5k7p9afyfukvm9yjzajhvrw7g32lhfcz2hfqfhwqcf5@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maila-de.linkedin.com> Jan 24 22:46:44 g1s2 postfix/cleanup[26708]: 048F520B3E7A: reject: header Message-ID: <1255321723.645664.1516855598980.JavaMail.app@ltx1-app10644.prod.linkedin.com> from maila-de.linkedin.com[108.174.6.141]; from=<s-2kevknojoowsv5k7p9afyfukvm9yjzajhvrw7g32lhfcz2hfqfhwqcf5@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maila-de.linkedin.com>: 5.7.1 message content rejected Jan 24 22:50:01 g1s2 postfix/smtpd[26821]: NOQUEUE: filter: RCPT from maila-af.linkedin.com[108.174.3.134]: <s-2ppdk5lgzvh8os3b9ncvusin84ioph9ryv3ijnpfrgqq8rbmr85b9l5v@bounce.linkedin.com>: Sender address triggers FILTER amavis:[127.0.0.1]:10026; from=<s-2ppdk5lgzvh8os3b9ncvusin84ioph9ryv3ijnpfrgqq8rbmr85b9l5v@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maila-af.linkedin.com> Jan 24 22:50:02 g1s2 postfix/cleanup[27061]: 144782022D28: reject: header Message-ID: <1216961161.778675.1516855800802.JavaMail.app@ltx1-app7001.prod.linkedin.com> from maila-af.linkedin.com[108.174.3.134]; from=<s-2ppdk5lgzvh8os3b9ncvusin84ioph9ryv3ijnpfrgqq8rbmr85b9l5v@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maila-af.linkedin.com>: 5.7.1 message content rejected Jan 24 22:50:28 g1s2 postfix/smtpd[26645]: NOQUEUE: filter: RCPT from maila-ac.linkedin.com[108.174.3.131]: <s-4xekocin7098esprkluw9ckj1snpqslox43iy8hk6xmmna2v0naopnw4@bounce.linkedin.com>: Sender address triggers FILTER amavis:[127.0.0.1]:10026; from=<s-4xekocin7098esprkluw9ckj1snpqslox43iy8hk6xmmna2v0naopnw4@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maila-ac.linkedin.com> Jan 24 22:50:29 g1s2 postfix/cleanup[27061]: 0ECFA2022D28: reject: header Message-ID: <1087564743.696618.1516855835519.JavaMail.app@ltx1-app10243.prod.linkedin.com> from maila-ac.linkedin.com[108.174.3.131]; from=<s-4xekocin7098esprkluw9ckj1snpqslox43iy8hk6xmmna2v0naopnw4@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maila-ac.linkedin.com>: 5.7.1 message content rejected Jan 25 07:04:56 g1s2 postfix/smtpd[22443]: NOQUEUE: filter: RCPT from maile-ab.linkedin.com[108.174.3.194]: <s-2pqkoxilsqr99gxg7co6gtxf137sv80blgesvta76n9awce62xt2jn8h@bounce.linkedin.com>: Sender address triggers FILTER amavis:[127.0.0.1]:10026; from=<s-2pqkoxilsqr99gxg7co6gtxf137sv80blgesvta76n9awce62xt2jn8h@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maile-ab.linkedin.com> Jan 25 07:04:56 g1s2 postfix/cleanup[23251]: C4CB4201D43E: reject: header Message-ID: <822351771.7274714.1516885503969.JavaMail.app@lva1-app4463.prod.linkedin.com> from maile-ab.linkedin.com[108.174.3.194]; from=<s-2pqkoxilsqr99gxg7co6gtxf137sv80blgesvta76n9awce62xt2jn8h@bounce.linkedin.com> to=<[email protected]> proto=ESMTP helo=<maile-ab.linkedin.com>: 5.7.1 message content rejected Notice, the sending server changes each time. I've tried adding @linkedin.com as suggested in the manual but these errors continue. Will that field accept @*.linkedin.com for the wild-card sending server names? It's not mentioned in the manual how to correct this in the filter... Thanks for the help!
I found the problem. There was a file called: /etc/postfix/header_checks with a bunch of stuff in it. (I think I had been experimenting previously and forgot to clear it.) Clearing the list from that file allowed the confirmation emails to come through the filter.
