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473
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1 Using sendmail + VERP
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2
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3 --------------------------------------------------------------------------------
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4
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5 The following configuration enables VERP (http://cr.yp.to/proto/verp.txt) which
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6 is useful for mailing list managers that are able to take advantage of that
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7 feature.
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8
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9 This configuration is currently used for using the mlmmj manager
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10 (http://mlmmj.mmj.dk) with VERP enabled + sendmail.
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11
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12 The hack consists in hooking VERP rewriting in a replacement ruleset for the
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13 existing EnvFromSMTP one (called VerpEnvFromSMTP). This is going to work *only*
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14 if we are splitting messages with multiple recipients in separate queue files
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15 since the macro we are using for the rewriting ($u) is not set when multiple
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16 rcpt are present.
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17
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18 The first step consists in forcing envelope splitting, this is done using the
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19 QUEUE_GROUP feature, here we are definining r=1 (max 1 rcpt per message) for the
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20 default queue group:
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21
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22
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23 QUEUE_GROUP(`mqueue', `P=/var/spool/mqueue, F=f, I=1m, R=2, r=1')
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24
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25
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26 Since we are going to split a lot it's advisable to use the FAST_SPLIT option,
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27 additionally we need to enforce return-path inclusion in the local mailer:
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28
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29
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30 define(`confFAST_SPLIT', `100')dnl
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31 define(`LOCAL_SHELL_FLAGS', `eu9P')dnl
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32
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33
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34 Then we define a regex map for matching the addresses that we are going to
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35 rewrite, in our example we'll rewrite addresses like
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36
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37 <listname+bounces-123@domain.net>
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38
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39 with
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40
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41 <listname+bounces-123-user=foo.net@domain.net>
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42
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43 where user@foo.net is the recipient address of the message. So we need to apply
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44 our verp ruleset *only* to those addresses. Additionally we are also adding the
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45 Delivered-To header:
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46
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47
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48 LOCAL_CONFIG
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49 Kmatch_verp regex -m -a@VERP (listname\+bounces\-[0-9]+<@domain\.net\.?>)
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50 H?l?Delivered-To: $u
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51
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52
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53 Here's the ruleset, the first half of the ruleset is the existing EnvFromSMTP
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54 ruleset present in default sendmail.cf, the seconf half is the VERP stuff:
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55
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56
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57 SVerpEnvFromSMTP
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58 R$+ $: $>PseudoToReal $1 sender/recipient common
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59 R$* :; <@> $@ list:; special case
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60 R$* $: $>MasqSMTP $1 qualify unqual'ed names
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61 R$+ $: $>MasqEnv $1 do masquerading
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62
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63 R $* $: $(match_verp $1 $) match the address
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64 R $* + $* < @ $* . > $* @VERP $: $1 + $2 - $&u < @ $3 . > $4 VERP rewrite it using $u macro and add VERP string for failsafe
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65 R $* - < @ $* . > $* VERP $: $1 < @ $2 . > $3 if $u wasn't defined rewrite the address back
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66 R $* - < $+ @ $+ > < @ $* . > $* VERP $: $(dequote $1 "-" $2 "=" $3 $) < @ $4 . > $5 replace the "@" in rcpt address with "="
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67 R $* - $+ @ $+ < @ $* . > $* VERP $: $(dequote $1 "-" $2 "=" $3 $) < @ $4 . > $5 replace the "@" in rcpt address with "="
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68
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69
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70 Finally we need to rewrite the mailer definition for the used mailer (typically
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71 esmtp) specifying VerpEnvFromSMTP as the sender rewrite ruleset:
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72
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73
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74 MAILER_DEFINITIONS
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75 Mesmtp, P=[IPC], F=mDFMuXa, S=VerpEnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,
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76 T=DNS/RFC822/SMTP,
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77 A=TCP $h
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78
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79
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80
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81 NOTE: for mailing list servers it's also a good idea keeping existing
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82 Delivered-To headers, sendmail needs the following patch for doing this
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83
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84 --- sendmail/conf.c.orig 2004-07-14 21:54:23.000000000 +0000
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85 +++ sendmail/conf.c 2004-12-06 15:22:05.000000000 +0000
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86 @@ -117,6 +117,7 @@
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87 { "content-length", H_ACHECK, NULL },
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88 { "subject", H_ENCODABLE, NULL },
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89 { "x-authentication-warning", H_FORCE, NULL },
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90 + { "delivered-to", H_FORCE, NULL },
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91
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92 { NULL, 0, NULL }
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93 };
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94
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95
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96 -- lcars@gentoo.org
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