From 19fc7e41dfa659176e41652a5637cdb8d78fbec6 Mon Sep 17 00:00:00 2001
From: Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
Date: Fri, 16 Jun 2023 09:08:17 -0700
Subject: [PATCH] check for common mail subdomains

---
 bin/letsencrypt-certonly.sh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/bin/letsencrypt-certonly.sh b/bin/letsencrypt-certonly.sh
index 3027e97..7659a5f 100755
--- a/bin/letsencrypt-certonly.sh
+++ b/bin/letsencrypt-certonly.sh
@@ -99,6 +99,28 @@ fi
 # copy above www subdomain section and modify as desired to
 # automatically check for and add additional subdomains to cert
 
+# check common additional mail subdomains
+if [[ $domain = mail.* ]]; then
+  # check for imap subdomain
+  dns=`host -t A ${domain/mail./imap.}|grep 'has address'|awk '{ print $4 }'`
+  if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+    command="$command -d ${domain/mail./imap.}"
+    dnscheck=true
+  fi
+  # check for smtp subdomain
+  dns=`host -t A ${domain/mail./smtp.}|grep 'has address'|awk '{ print $4 }'`
+  if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+    command="$command -d ${domain/mail./smtp.}"
+    dnscheck=true
+  fi
+  # check for pop subdomain
+  dns=`host -t A ${domain/mail./pop.}|grep 'has address'|awk '{ print $4 }'`
+  if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+    command="$command -d ${domain/mail./pop.}"
+    dnscheck=true
+  fi
+fi
+
 # check if any of the dns lookups passed
 if [[ "$dnscheck" = "false" ]]; then
   echo "All dns checks failed, can't create cert."