fix: rename script

html_mail_send.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# send_mail.sh - A sophisticated HTML email sender
+# html_mail_send.sh - A sophisticated HTML email sender
 # Sends HTML emails via SMTP with style
 #
 
@@ -227,7 +227,7 @@ show_usage() {
 }
 
 show_version() {
-    echo -e "${BMAG}${SYM_MAIL}${RST} ${BWHT}send_mail.sh${RST} ${ACC1}v${VERSION}${RST}"
+    echo -e "${BMAG}${SYM_MAIL}${RST} ${BWHT}html_mail_send.sh${RST} ${ACC1}v${VERSION}${RST}"
 }
 
 # ═══════════════════════════════════════════════════════════════════════════════
@@ -394,7 +394,7 @@ send_email() {
         printf 'Message-ID: %s\r\n' "$msg_id"
         printf 'MIME-Version: 1.0\r\n'
         printf 'Content-Type: multipart/alternative; boundary="%s"\r\n' "$boundary"
-        printf 'X-Mailer: send_mail.sh/%s\r\n' "$VERSION"
+        printf 'X-Mailer: html_mail_send.sh/%s\r\n' "$VERSION"
         printf '\r\n'
         printf -- '--%s\r\n' "$boundary"
         printf 'Content-Type: text/plain; charset="UTF-8"\r\n'