diff --git a/src/mailer.cr b/src/mailer.cr
index 0235c57..3d894ae 100644
--- a/src/mailer.cr
+++ b/src/mailer.cr
@@ -18,6 +18,8 @@ class Baguette::Configuration
 		# for machines without glibc (such as on alpine linux).
 		property smtpd_host : String = "127.0.0.1"
 		property smtpd_port : UInt16 = 25
+		# "your.host.example.com"
+		property smtpd_helo_domain : String = "localhost"
 
 		property verbosity  : Int32 = 3
 
@@ -101,7 +103,7 @@ opt_help = -> (parser : OptionParser) {
 
 
 parser = OptionParser.new do |parser|
-	parser.banner = "Welcome on the Altideal CLI administration."
+	parser.banner = "Mailer."
 	parser.on "-v verbosity", "--verbosity v", "Verbosity. From 0 to 4 (debug)." do |v|
 		Baguette::Context.verbosity = v.to_i
 		Baguette::Log.info "verbosity = #{v}"
@@ -208,7 +210,9 @@ def main
 		pp! mail_conf
 	end
 
-	smtpd_config = EMail::Client::Config.new mail_conf.smtpd_host, mail_conf.smtpd_port.to_i
+	smtpd_config = EMail::Client::Config.new mail_conf.smtpd_host,
+		mail_conf.smtpd_port.to_i,
+		helo_domain: mail_conf.smtpd_helo_domain
 	smtpd_client = EMail::Client.new smtpd_config
 
 	actions = Actions.new mail_conf, smtpd_client