https://github.com/libesmtp/libESMTP/pull/7

From 4543d5a6848a752d690150b6987ca9c556d793fc Mon Sep 17 00:00:00 2001
From: "Jeremy T. Bouse" <Jeremy.Bouse@UnderGrid.net>
Date: Mon, 7 Jun 2021 20:44:37 -0400
Subject: [PATCH] Update to correct SONAME version

Pass as version to allow Meson to manage SONAME version.
--- a/meson.build
+++ b/meson.build
@@ -208,7 +208,7 @@ vflag = '-Wl,--version-script,@0@/@1@'.format(meson.current_source_dir(), mapfil
 
 lib = library('esmtp', sources,
 	      link_args : vflag, link_depends : mapfile,
-	      soversion : libesmtp_so_version,
+	      version : libesmtp_so_version,
 	      dependencies : deps,
 	      install : true)