This patch adds a new option to couriermlm: NODSN=flag.

If flag is "1" couriermlm will use a Delivery Status Notification setting of "never" when it sends confirmation requests and help messages: this should reduce the amount of useless failure notifications generated when couriermlm dutifully replies to spam received by the mailing list administrative addresses, i.e. -(un)subscribe and -help.

If flag is "0" (the default), a DSN setting of "fail" will be used. This is what couriermlm does currently.

The patch is against courier 0.53.3 as packaged by Debian; it should apply cleanly to the original sources. I hope you'll find it useful. I've been using it in production for a few months now and I can tell you it's a pleasure to stop getting a few bogus DSNs in your inbox every day.

-- Flavio Stanchina Informatica e Servizi Trento - Italy

diff --git a/courier/cmlm3.C b/courier/cmlm3.C index 65336dd..ca6ad7c 100644 --- a/courier/cmlm3.C +++ b/courier/cmlm3.C @@ -442,9 +442,10 @@ pid_t p2;

// // Run sendmail with the -bcc flag, requesting only FAIL notices. +// If 'nodsn' is set, request no delivery status notices at all. //

-int sendmail_bcc(pid_t &p, const char *from) +int sendmail_bcc(pid_t &p, const char *from, int nodsn) { const char *argvec[7];

@@ -453,7 +454,7 @@ const char *argvec[7]; argvec[2]="-f"; argvec[3]=from; argvec[4]="-N"; - argvec[5]="fail"; + argvec[5]=nodsn?"never":"fail"; argvec[6]=0; return (sendmail(argvec, p)); } diff --git a/courier/cmlm.C b/courier/cmlm.C index 0ad9904..9d85296 100644 --- a/courier/cmlm.C +++ b/courier/cmlm.C @@ -1052,7 +1052,8 @@ struct stat sb; close(open(vaddr, O_RDWR|O_CREAT, 0755));

CString owner=get_verp_return("owner", 0); -afxopipestream ack(sendmail_bcc(p, owner)); +int nodsn= (cmdget("NODSN") == "1"); +afxopipestream ack(sendmail_bcc(p, owner, nodsn));

ack << "From: " << myname() << " <" << owner << ">" << endl << "To: " << addr << endl diff --git a/courier/cmlm.h b/courier/cmlm.h index 4746a8d..df2d43a 100644 --- a/courier/cmlm.h +++ b/courier/cmlm.h @@ -137,7 +137,7 @@ void addrlower(char *); int isfound(const char *, size_t); int sendmail(const char **, pid_t &); int wait4sendmail(pid_t); -int sendmail_bcc(pid_t &, const char *); +int sendmail_bcc(pid_t &, const char *, int nodsn = 0);

int goodconfirm(CString);

diff --git a/courier/cmlmsubunsubmsg.C b/courier/cmlmsubunsubmsg.C index f9cc576..8e3c06d 100644 --- a/courier/cmlmsubunsubmsg.C +++ b/courier/cmlmsubunsubmsg.C @@ -330,7 +330,8 @@ CString buf; }

pid_t p; -afxopipestream ack(sendmail_bcc(p, owner)); +int nodsn= (cmdget("NODSN") == "1"); +afxopipestream ack(sendmail_bcc(p, owner, nodsn));

ack << "Bcc: " << sendto << endl;

diff --git a/courier/doc/couriermlm.1.in b/courier/doc/couriermlm.1.in index 482e495..3cc2d45 100644 --- a/courier/doc/couriermlm.1.in +++ b/courier/doc/couriermlm.1.in @@ -490,6 +490,16 @@ not attempt to block misdirected subscri to the mailing list's posting address. If flag is "1" (the default), those kinds of messages will be bounced appropriately. .TP +\fBNODSN=\fIflag\fB\fR +If flag is "1" \fBcouriermlm\fR will +use a Delivery Status Notification setting of "never" +when it sends confirmation requests and help messages: +this should reduce the amount of useless failure notifications generated +when \fBcouriermlm\fR dutifully replies to spam received by the mailing +list administrative addresses, i.e. -(un)subscribe and -help. +If flag is "0" (the default), a DSN setting of "fail" will be used. +Please see sendmail(1)'s -n option for more details on the DSN setting. +.TP \fBPOST=\fIoption\fB\fR Set posting options. \fIoption\fR is one of three values: "subscribers" - only subscribers may