[PATCH] cygwin-htdocs/lists.html: add note about attachment size limits

[Brian Inglis <Brian.Inglis@SystematicSW.ab.ca>]

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committer please adjust based on actual size limits if different:
(256KB - 8KB email text)/1.37 overhead ~ 180KB
180KB * 1.37 overhead + 8KB email text ~ 256KB
---
 lists.html | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)


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diff --git a/lists.html b/lists.html
index fb784f8d2732..a3beda2d64e0 100755
--- a/lists.html
+++ b/lists.html
@@ -42,7 +42,14 @@ answer.</p>
 <div class="smaller">
 <ul class="spaced">
 
-<li><b>None of the below lists accept <a href="https://sourceware.org/lists.html#html-mail">html mail</a>.  Use plain text only.</b></li>
+<li><b>None of the below lists accept
+<a href="https://sourceware.org/lists.html#html-mail">html mail</a>.
+Use plain text only.</b>
+If you include attachments, please try to ensure they are in plain text,
+and limit them to about <b>180KB</b>, as with encoding and email overhead,
+any larger will exceed the size limits for emails to these lists.</li>
+<!-- 180KB * 1.37 overhead + 8KB email text ~ 256KB -->
+<!-- (256KB - 8KB email text)/1.37 overhead ~ 180KB -->
 
 <li><b>Please do not feed the spammers by <a href="acronyms/#PCYMTNQREAIYR">including raw email addresses</a> in the body of your message.</b></li>