+diff -udprP mutt-1.10.0.orig/hdrline.c mutt-1.10.0/hdrline.c
+--- mutt-1.10.0.orig/hdrline.c 2018-05-15 00:51:53.000000000 +0300
++++ mutt-1.10.0/hdrline.c 2018-06-16 17:17:07.682610173 +0300
+@@ -228,6 +228,7 @@ static char *apply_subject_mods (ENVELOP
+ * %f = entire from line
+ * %F = like %n, unless from self
+ * %i = message-id
++ * %I = initials of author
+ * %l = number of lines in the message
+ * %L = like %F, except `lists' are displayed first
+ * %m = number of messages in the mailbox
+@@ -478,6 +479,31 @@ hdr_format_str (char *dest,
+ mutt_format_s (dest, destlen, prefix, hdr->env->message_id ? hdr->env->message_id : "<no.id>");
+ break;
+
++ case 'I':
++ {
++ int iflag = FALSE;
++ int j = 0;
++
++ for (i = 0; hdr->env->from && hdr->env->from->personal &&
++ hdr->env->from->personal[i] && j < SHORT_STRING - 1; i++)
++ {
++ if (isalpha ((int)hdr->env->from->personal[i]))
++ {
++ if (!iflag)
++ {
++ buf2[j++] = hdr->env->from->personal[i];
++ iflag = TRUE;
++ }
++ }
++ else
++ iflag = FALSE;
++ }
++
++ buf2[j] = '\0';
++ }
++ mutt_format_s (dest, destlen, prefix, buf2);
++ break;
++
+ case 'l':
+ if (!optional)
+ {
+diff -udprP mutt-1.10.0.orig/PATCHES mutt-1.10.0/PATCHES
+--- mutt-1.10.0.orig/PATCHES 2017-12-03 05:10:17.000000000 +0200
++++ mutt-1.10.0/PATCHES 2018-06-16 17:17:07.683610157 +0300
+@@ -0,0 +1 @@
++vvv.initials