我创建了一组Docker容器来运行Web应用程序（pyhton / django）。一个如果他们是smtp服务器：
smtp:
image: namshi/smtp:latest
networks:
- nginx_ext_network
environment:
MAILNAME: 'mailer'
restart: always
ports:
- "25:25"
但是随后Web应用程序要求发送电子邮件，smtp服务器尝试执行此操作，但是失败。 我尝试了多次。具有不同的端口。用不同的电子邮件。什么都没有。
smtp容器的日志：
+ sed -ri '
s/^#?(dc_local_interfaces)=.*/\1='\''[0.0.0.0]:25 ; [::0]:25'\''/;
s/^#?(dc_other_hostnames)=.*/\1='\'''\''/;
s/^#?(dc_relay_nets)=.*/\1='\''172.19.0.2\/16'\''/;
s/^#?(dc_eximconfig_configtype)=.*/\1='\''internet'\''/;
' /etc/exim4/update-exim4.conf.conf
+ update-exim4.conf -v
using non-split configuration scheme from /etc/exim4/exim4.conf.template
1 LOG: MAIN
1 exim 4.89 daemon started: pid=1, -q15m, listening for SMTP on port 25 (IPv6 and IPv4)
273 LOG: MAIN
273 <= webmaster@localhost H=mailer_apache_1.mailer_nginx_ext_network (83d1331a44cb) [172.19.0.3] P=esmtp S=2162 id=156606357503.34.13723816267095054951@83d1331a44cb
273 LOG: smtp_connection MAIN
273 SMTP connection from mailer_apache_1.mailer_nginx_ext_network (83d1331a44cb) [172.19.0.3] closed by QUIT
274 Exim version 4.89 uid=101 gid=101 pid=274 D=40001
Berkeley DB: Berkeley DB 5.3.28: (September 9, 2013)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages DKIM DNSSEC Event OCSP PRDR SOCKS TCP_Fast_Open
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch nis nis0 passwd
Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
274 delivering 1hz2fv-00004P-1K
274 R: dnslookup for djangomailape@gmail.com
275 T: remote_smtp for djangomailape@gmail.com
275 Connecting to gmail-smtp-in.l.google.com [2a00:1450:4010:c08::1a]:25 ... failed: Cannot assign requested address
275 LOG: MAIN
275 H=gmail-smtp-in.l.google.com [2a00:1450:4010:c08::1a] Cannot assign requested address
275 Connecting to gmail-smtp-in.l.google.com [64.233.165.27]:25 ... connected
275 SMTP(close)>>
275 LOG: MAIN
275 H=gmail-smtp-in.l.google.com [64.233.165.27]: Remote host closed connection in response to initial connection
275 Connecting to alt1.gmail-smtp-in.l.google.com [2404:6800:4008:c04::1a]:25 ... failed: Cannot assign requested address
275 LOG: MAIN
275 H=alt1.gmail-smtp-in.l.google.com [2404:6800:4008:c04::1a] Cannot assign requested address
275 Connecting to alt1.gmail-smtp-in.l.google.com [74.125.204.27]:25 ... connected
275 SMTP(close)>>
275 LOG: MAIN
275 H=alt1.gmail-smtp-in.l.google.com [74.125.204.27]: Remote host closed connection in response to initial connection
275 Connecting to alt2.gmail-smtp-in.l.google.com [2607:f8b0:400e:c04::1b]:25 ... failed: Cannot assign requested address
275 LOG: MAIN
275 H=alt2.gmail-smtp-in.l.google.com [2607:f8b0:400e:c04::1b] Cannot assign requested address
275 Connecting to alt3.gmail-smtp-in.l.google.com [2607:f8b0:4003:c09::1b]:25 ... failed: Cannot assign requested address
275 LOG: MAIN
275 H=alt3.gmail-smtp-in.l.google.com [2607:f8b0:4003:c09::1b] Cannot assign requested address
275 Connecting to alt4.gmail-smtp-in.l.google.com [2607:f8b0:4001:c16::1b]:25 ... failed: Cannot assign requested address
275 LOG: MAIN
275 H=alt4.gmail-smtp-in.l.google.com [2607:f8b0:4001:c16::1b] Cannot assign requested address
274 LOG: MAIN
274 == djangomailape@gmail.com R=dnslookup T=remote_smtp defer (99): Cannot assign requested address H=alt1.gmail-smtp-in.l.google.com [74.125.204.27]
276 LOG: MAIN
276 <= webmaster@localhost H=mailer_apache_1.mailer_nginx_ext_network (83d1331a44cb) [172.19.0.3] P=esmtp S=2187 id=156606361852.33.3228996691969512605@83d1331a44cb
276 LOG: smtp_connection MAIN
276 SMTP connection from mailer_apache_1.mailer_nginx_ext_network (83d1331a44cb) [172.19.0.3] closed by QUIT
277 Exim version 4.89 uid=101 gid=101 pid=277 D=40001
Berkeley DB: Berkeley DB 5.3.28: (September 9, 2013)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages DKIM DNSSEC Event OCSP PRDR SOCKS TCP_Fast_Open
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch nis nis0 passwd
Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
277 delivering 1hz2gc-00004S-H8
277 R: dnslookup for eleriya-25@yandex.ru
278 T: remote_smtp for eleriya-25@yandex.ru
278 Connecting to mx.yandex.ru [2a02:6b8::89]:25 ... failed: Cannot assign requested address
278 LOG: MAIN
278 H=mx.yandex.ru [2a02:6b8::89] Cannot assign requested address
278 Connecting to mx.yandex.ru [87.250.250.89]:25 ... connected
278 SMTP(close)>>
278 LOG: MAIN
278 H=mx.yandex.ru [87.250.250.89]: Remote host closed connection in response to initial connection
278 Connecting to mx.yandex.ru [213.180.193.89]:25 ... connected
278 SMTP(close)>>
278 LOG: MAIN
278 H=mx.yandex.ru [213.180.193.89]: Remote host closed connection in response to initial connection
278 Connecting to mx.yandex.ru [213.180.204.89]:25 ... connected
278 SMTP(close)>>
278 LOG: MAIN
278 H=mx.yandex.ru [213.180.204.89]: Remote host closed connection in response to initial connection
278 Connecting to mx.yandex.ru [77.88.21.89]:25 ... connected
278 SMTP(close)>>
278 LOG: MAIN
278 H=mx.yandex.ru [77.88.21.89]: Remote host closed connection in response to initial connection
277 LOG: MAIN
277 == eleriya-25@yandex.ru R=dnslookup T=remote_smtp defer (-18) H=mx.yandex.ru [77.88.21.89]: Remote host closed connection in response to initial connection
有什么建议吗？