For what it's worth (hmmm, probably not a whole lot if you think about it!),
here's the mailer representation on mutt-* (as percentages of messages with
valid X-Mailer/User-Agent header or with the pine message-id). I'm ignoring
the sub-versions of mutt and everything <= 0.1%...
mutt-users mutt-dev
24.40% |Mutt 95| 22.69% |Mutt 94|
13.90% |Mutt 93| 13.72% |Mutt 95|
9.07% |Mutt 84| 13.48% |Mutt 92|
8.72% |Mutt 91| 9.51% |Mutt 87|
7.54% |Mutt 88| 6.83% |Mutt 88|
5.45% |Mutt 94| 5.67% |Mutt 93|
3.86% |Mutt 96| 5.43% |Mutt 96|
3.68% |Mutt 85| 4.44% |Mutt 84|
3.45% |Mutt 92| 4.39% |Mutt 90|
3.38% |Mutt 89| 3.78% |Mutt 86|
2.83% |Mutt 81| 3.46% |Mutt 91|
2.69% |Mutt 87| 2.24% |Mutt 83|
2.60% |Mutt 90| 1.15% |Mutt 85|
2.48% |Mutt 83| 0.90% |Mutt 81|
1.30% |Mutt 76| 0.79% |Mutt 89|
0.85% |Mutt 86| 0.26% |Mutt 82|
0.45% |Mutt 82| 0.15% |Windows Eudora Pro v2.2 (32)|
0.36% |pine| 0.11% |Mutt 76|
0.33% |Mutt 79| 0.10% |tin/pre-1.4-971127 (UNIX)|
0.11% |ELM [2.3 PL11] for OS/2| 0.10% |Mutt 79|
0.11% |Mozilla 4.5 [en] (WinNT; I)|
0.11% |Mutt 74|
0.10% |Microsoft Outlook Express 4.72.3110.1|
0.10% |Frederik's Registered PMMail 1.51 For OS/2|
0.10% |Windows Eudora Pro Version 2.2 (32)|
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-e