I had significant trouble getting hamtrap/spamtrap to function in my environment. I’ve solved the various issuesI and am posting this in hopes it will help others (and possibly lead to the necessary bug fixes and/or official documentation changes. I’m happy to help as I’m able.)
For spamtrap/hamtrap to function properly:
- Change this default: (Webmin)->Servers->Spamassassin->Message Modification change
"Put original message into attachment?"to NO. The default of YES breaks spam/ham trap. - Modify your outgoing email address setup as needed, at least for forwarding to spam/ham trap:
- Although email addresses are not case sensitive, when forwarding to spam/ham trap you must forward using a lower case mail name, and it must be a mailbox address, not an alias. (For security, I never expose my mailbox address to the outside world. Others only see aliases. This is my first exception in decades.)
- Whatever domain you use to forward email to spam/ham trap must be set up as a virtual server (alias is fine) with email enabled. (See below for some details on this.)
Still having trouble? Here’s how to diagnose additional issues:
- Add these lines near the top of
/usr/share/webmin/virtual-server/spamtrap.pl
(I placed them after the line starting with$debug = 1; $nodelete=1;$salearn. - Forward a message to spamtrap or hamtrap
- Go to (webmin)->Webmin Configuration->Webmin Scheduled Functions
- Check the box next to the spamtrap.pl line
- Click on Run Selected Functions Now
- You should get (immediately) a set of debug output lines
Issues I faced:
(NOTE: The first two bullets were accepted as bugs, and are patched in the next Webmin release!)
-
Invalid Received line, in this form: `Received: by my.dom.ain (Postfix, from userid 1022) …
- This is a bug, as that’s a perfectly valid line, seen when Postfix receives “local submissions” either from an on-server process, or email via an SSH tunnel. Temporary workaround:
- Edit
/usr/share/webmin/virtual-server/spamtrap.pl - Near the end, find the line containing `Authenticated, and insert the following before:
elsif ($str =~ /by\s+(\S+)\s+\(Postfix, from userid (\S+)\)/i) { # by my.dom.ain (Postfix, from userid 1022) $uname = getpwuid($2); } -
No recognized user in the email. I consider this a bug. Webmin only checks the from, to and cc headers, and compares (mailboxes) x (domains and alias domains). Email to or forwarded by an alias is ignored. Workaround for now:
- Edit
/usr/share/webmin/virtual-server/spamtrap.pl - Find this line:
foreach $h ('from', 'to', 'cc') { - Change it to:
foreach $h ('from', 'to', 'cc','resent-from','delivered-to') {
- Edit
-
Invalid Local Received header: the IP address made no sense. This check is not adjustable in Webmin. (In my case, it was an APIPA (169.254.x.x) address?! Turns out there’s a longstanding Windows bug that often returns the wrong answer when software asks for the host ip. On my laptop, running
ipconfigshows a TAP-Win virtual adapter as the source of that address. Nothing I do fixes this… other than finding a detail setting in my email client for forcing the SMTP HELO/EHLO client domain name. That worked!)
I think this covers everything. I may have missed something, so feel free to ask.
ADDITIONAL NOTES
- Debug output doesn’t handle anything that smells like HTML (web codes) at all…which means email addresses too. They show up as invisible in debug displays. Workarounds:
- Quick and dirty: Enable (more tools)->developer tools in your browser, and Inspect the html of interest. You’ll likely find hidden data.
- Much nicer in the long run: Install Data::Dumper::HTML and use that to create debug output
- From elevated shell, run
cpan– it may want to update. That’s fine. ‘q’ quits cpan -i Data-Dumper-HTML(say yes as needed
)- Near the top of the *.pl file, insert:
use Data::Dumper::HTML qw(dumper_html); - Adjust debug output as needed. One of my lines:
print STDERR "$d->{'dom'}: headers=", dumper_html($m->{'header'}) if ($debug);
- From elevated shell, run
- If you must add debug code to a library function that’s part of WebminCore, your changes will not be seen until you do:
service webmin restart - Virtual Alias Server “email support” makes these changes:
- Adds/removes the alias domain to MyNetworks in
/etc/postfix/main.cf - Adds/removes aliases for the domain and every mailbox to
/etc/postfix/virtual
- Adds/removes the alias domain to MyNetworks in
| SYSTEM INFORMATION | |
|---|---|
| Operating system Debian Linux 10 | |
| Webmin version 1.981 | |
| Usermin version 1.823 | |
| Virtualmin version 6.17-3 | |
| Authentic theme version 19.83-2 |
