HAProxy fails on restart

If i restart our Ubuntu 18.04 Server with HAProxy 1.8.8 it fails with the error:

service haproxy status

**●** haproxy.service - HAProxy Load Balancer
Loaded: loaded (/lib/systemd/system/haproxy.service; enabled; vendor preset: enabled)
Active: **failed** (Result: exit-code) since Sun 2019-02-03 19:29:25 CET; 2min 43s ago
Docs: man:haproxy(1)
file:/usr/share/doc/haproxy/configuration.txt.gz
Process: 1047 ExecStartPre=/usr/sbin/haproxy -f $CONFIG -c -q $EXTRAOPTS **(code=exited, status=1/FAILURE)**
Feb 03 19:29:25 lb02 systemd[1]: haproxy.service: Service hold-off time over, scheduling restart.
Feb 03 19:29:25 lb02 systemd[1]: haproxy.service: Scheduled restart job, restart counter is at 5.
Feb 03 19:29:25 lb02 systemd[1]: Stopped HAProxy Load Balancer.
Feb 03 19:29:25 lb02 systemd[1]: **haproxy.service: Start request repeated too quickly.**
Feb 03 19:29:25 lb02 systemd[1]: **haproxy.service: Failed with result 'exit-code'.**
Feb 03 19:29:25 lb02 systemd[1]: **Failed to start HAProxy Load Balancer.**

And haproxy.log contains:

Feb  3 19:53:41 lb02 haproxy[869]: [ALERT] 033/195341 (869) : parsing [/etc/haproxy/haproxy.cfg:82] : 'mailer smtp1' : invalid address: 'subdomain.hostname.com' in 'subdomain.hostname.com:25'
Feb  3 19:53:41 lb02 haproxy[869]: [ALERT] 033/195341 (869) : Error(s) found in configuration file : /etc/haproxy/haproxy.cfg
Feb  3 19:53:41 lb02 haproxy[869]: [ALERT] 033/195341 (869) : Fatal errors found in configuration.

In haproxy.conf my config looks like:

mailers mymailers01
	 mailer smtp1 subdomain.hostname.com:25

If i manually do “service haproxy restart” it’s working again.

haproxy -vv
HA-Proxy version 1.8.8-1ubuntu0.3 2019/01/11
Copyright 2000-2018 Willy Tarreau <willy@haproxy.org>

Build options :
  TARGET  = linux2628
  CPU     = generic
  CC      = gcc
  CFLAGS  = -g -O2 -fdebug-prefix-map=/build/haproxy-_XfIfg/haproxy-1.8.8=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2
  OPTIONS = USE_GETADDRINFO=1 USE_ZLIB=1 USE_REGPARM=1 USE_OPENSSL=1 USE_LUA=1 USE_SYSTEMD=1 USE_PCRE=1 USE_PCRE_JIT=1 USE_NS=1

Default settings :
  maxconn = 2000, bufsize = 16384, maxrewrite = 1024, maxpollevents = 200

Built with OpenSSL version : OpenSSL 1.1.0g  2 Nov 2017
Running on OpenSSL version : OpenSSL 1.1.0g  2 Nov 2017
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports : TLSv1.0 TLSv1.1 TLSv1.2
Built with Lua version : Lua 5.3.3
Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND
Encrypted password support via crypt(3): yes
Built with multi-threading support.
Built with PCRE version : 8.39 2016-06-14
Running on PCRE version : 8.39 2016-06-14
PCRE library supports JIT : yes
Built with zlib version : 1.2.11
Running on zlib version : 1.2.11
Compression algorithms supported : identity("identity"), deflate("deflate"), raw-deflate("deflate"), gzip("gzip")
Built with network namespace support.

Available polling systems :
      epoll : pref=300,  test result OK
       poll : pref=200,  test result OK
     select : pref=150,  test result OK
Total: 3 (3 usable), will use epoll.

Available filters :
	[SPOE] spoe
	[COMP] compression
	[TRACE] trace

Any idea?

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