Package: msmtp
Version: 1.6.7-1
Severity: important

Hi,

I've been successfully using msmtp for a while with a GMX account. I
recently tried using it with a Zoho account, and it does not work: after
transmitting the message and apparently sending <CRLF>.<CRLF>, it just
hangs, and eventually dies:

~# echo "test" | msmtp -d -a default xxxxx...@gmail.com
loaded system configuration file /etc/msmtprc
ignoring user configuration file /root/.msmtprc: No such file or directory
using account default from /etc/msmtprc
host = smtp.zoho.com
port = 465
proxy host = (not set)
proxy port = 0
timeout = off
protocol = smtp
domain = localhost
auth = choose
user = xxxxx...@zoho.com
password = *
passwordeval = (not set)
ntlmdomain = (not set)
tls = on
tls_starttls = off
tls_trust_file = /etc/ssl/certs/ca-certificates.crt
tls_crl_file = (not set)
tls_fingerprint = (not set)
tls_key_file = (not set)
tls_cert_file = (not set)
tls_certcheck = on
tls_min_dh_prime_bits = (not set)
tls_priorities = (not set)
auto_from = off
maildomain = (not set)
from = xxxxx...@zoho.com
add_missing_from_header = on
add_missing_date_header = on
remove_bcc_headers = on
dsn_notify = (not set)
dsn_return = (not set)
logfile = (not set)
syslog = LOG_MAIL
aliases = (not set)
reading recipients from the command line
TLS certificate information:
    Owner:
        Common Name: *.zoho.com
    Issuer:
        Common Name: Thawte RSA CA 2018
        Organization: DigiCert Inc
        Organizational unit: www.digicert.com
        Country: US
    Validity:
        Activation time: Thu 02 Aug 2018 08:00:00 PM EDT
        Expiration time: Thu 01 Oct 2020 08:00:00 AM EDT
    Fingerprints:
        SHA256: 
6E:51:AA:92:96:77:6A:D8:04:D0:C8:6A:AB:7D:DB:F7:49:87:00:67:DB:BD:61:8D:77:A0:20:A5:94:31:A7:C3
        SHA1 (deprecated): 
8B:F7:EE:CF:D3:6A:FC:AB:CC:61:92:4E:87:E6:5E:B9:88:9D:B2:CC
<-- 220 mx.zohomail.com SMTP Server ready December 24, 2018 7:19:35 PM PST
--> EHLO localhost
<-- 250-mx.zohomail.com Hello localhost xxxxxxxx
<-- 250-AUTH LOGIN PLAIN
<-- 250 SIZE 53477376
--> AUTH PLAIN xxxxxxxx
<-- 235 Authentication Successful
--> MAIL FROM:<xxxxx...@zoho.com>
<-- 250 Sender <xxxxx...@zoho.com> OK
--> RCPT TO:<xxxxx...@gmail.com>
<-- 250 Recipient <xxxxx...@gmail.com> OK
--> DATA
<-- 354 Ok Send data ending with <CRLF>.<CRLF>
--> From: xxxxx...@zoho.com
--> Date: Mon, 24 Dec 2018 22:19:35 -0500
--> test
--> .
msmtp: the server sent an empty reply
msmtp: could not send mail (account default from /etc/msmtprc)

Sending via Zoho works fine with Sylpheed, or Swaks:

~$ swaks -t xxxxx...@gmail.com -f xxxxx...@zoho.com --protocol SSMTP -s 
smtp.zoho.com -a
Username: xxxxx...@zoho.com
Password: xxxxxxxx
=== Trying smtp.zoho.com:465...
=== Connected to smtp.zoho.com.
=== TLS started with cipher TLSv1.2:ECDHE-RSA-AES256-SHA:256
=== TLS no local certificate set
=== TLS peer DN="/CN=*.zoho.com"
<~  220 mx.zohomail.com SMTP Server ready December 24, 2018 7:08:53 PM PST
 ~> EHLO xxxxxxxx
<~  250-mx.zohomail.com Hello xxxxxxxx
<~  250-AUTH LOGIN PLAIN
<~  250 SIZE 53477376
 ~> AUTH LOGIN
<~  334 xxxxxxxx
 ~> xxxxxxxx
<~  334 xxxxxxxx
 ~> xxxxxxxx
<~  235 Authentication Successful
 ~> MAIL FROM:<xxxxx...@zoho.com>
<~  250 Sender <xxxxx...@zoho.com> OK
 ~> RCPT TO:<xxxxx...@gmail.com>
<~  250 Recipient <xxxxx...@gmail.com> OK
 ~> DATA
<~  354 Ok Send data ending with <CRLF>.<CRLF>
 ~> Date: Mon, 24 Dec 2018 22:08:36 -0500
 ~> To: xxxxx...@gmail.com
 ~> From: xxxxx...@zoho.com
 ~> Subject: test Mon, 24 Dec 2018 22:08:36 -0500
 ~> Message-Id: xxxxxxxx
 ~> X-Mailer: swaks v20181104.0 jetmore.org/john/code/swaks/
 ~> 
 ~> This is a test mailing
 ~> 
 ~> 
 ~> .
<~  250 Message received
 ~> QUIT
<~  221 mx.zohomail.com closing connection
=== Connection closed with remote host.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), 
LANGUAGE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages msmtp depends on:
ii  debconf [debconf-2.0]  1.5.69
ii  libc6                  2.28-3
ii  libgnutls30            3.6.5-2
ii  libgsasl7              1.8.0-8+b2
ii  ucf                    3.0038+nmu1

Versions of packages msmtp recommends:
ii  ca-certificates  20180409

Versions of packages msmtp suggests:
ii  msmtp-mta  1.6.7-1

-- debconf information:
  msmtp/port: 587
  msmtp/sysconfig: true
  msmtp/auto_from: true
  msmtp/tls: on /etc/ssl/certs/ca-certificates.crt
  msmtp/maildomain:
* msmtp/host: mail.gmx.com

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