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DNS server reports incorrect packet format

Hello,

MDaemon does not send emails to the smart host.
The emails remain in the queue.

Tue 2019-09-24 10:07:21.683: Session 167203; child 0001
Tue 2019-09-24 10:07:21.684: Parsing message
<c:\mdaemon\queues\remote\pd35000000001.msg>
Tue 2019-09-24 10:07:21.684: * From: xxxxxx@xxx.de
Tue 2019-09-24 10:07:21.684: * To: yyyyyyy@xxx.de
Tue 2019-09-24 10:07:21.684: * Subject: test
Tue 2019-09-24 10:07:21.684: * Size (bytes): 4880
Tue 2019-09-24 10:07:21.684: * Message-ID:
<afeeb760-9cf8-9096-1225-ef1f9c0f0495@panscher.de>
Tue 2019-09-24 10:07:21.686: Attempting to send message to smart host
Tue 2019-09-24 10:07:21.686: Attempting SMTP connection to smtp.strato.de
Tue 2019-09-24 10:07:21.686: Resolving AAAA record for smtp.strato.de
(DNS Server: fd00::464e:6dff:fe9d:151a)...
Tue 2019-09-24 10:07:21.688: * DNS-Server meldet falsches Paketformat

DNS server reports incorrect packet format

Tue 2019-09-24 10:07:21.688: Resolving A record for smtp.strato.de (DNS
Server: fd00::464e:6dff:fe9d:151a)...
Tue 2019-09-24 10:07:21.689: * DNS-Server meldet falsches Paketformat
Tue 2019-09-24 10:07:21.689: * Diese Nachricht ist 0 Minuten alt und
darf noch 60 Minuten in dieser Warteschlange verbleiben
Tue 2019-09-24 10:07:21.689: SMTP session terminated (Bytes in/out: 0/0)
Tue 2019-09-24 10:07:21.689: ----------

---
Martin

David C - Sep 30, 2019 2:39 pm (#1 Total: 1)

David C

Guru
Posts: 1411

In order to know to what IP address MDaemon must connect in order to send an email to a receiving, it must first query a DNS server to obtain the IP address of that receiving server.

According to MXToolbox.com, the host name which you are attempting to look (" smtp.strato.de ") up has only an IPv4 address (" 81.169.145.133 ")

https://mxtoolbox.com/SuperTool.aspx?action=a%3asmtp.strato.de&run=networktools

Is the DNS server you are querying capable of returning IPv4 addresses?

Does the issue you describe occur if you configure your copy of MDaemon to use a different DNS server/servers?

From the MDaemon online "Help" file:

http://help.altn.com/mdaemon/en/index.html?default-domain-and-servers_dns.htm

DNS Servers

Use Windows DNS servers

When this option is selected, MDaemon will use all DNS servers found within your Windows TCP/IP configuration. MDaemon will try each DNS server once per lookup operation and in sequence until it exhausts the complete list of DNS servers or finds the first one that works. If you include additional DNS servers in the Manually configured DNS Servers option below, MDaemon will try those servers as well. Finally, at startup the System log will display each DNS server and indicate its source (i.e. manually configured or taken from Windows).

Reload DNS server hourly

Check this box if you wish to reload the DNS server every hour. This is disabled by default.

Manually configured DNS servers

MDaemon will use all DNS servers specified here when performing DNS lookups. MDaemon will try each server once per lookup operation and in sequence until it exhausts the complete list of DNS servers or finds the first one that works. If you enable the Use Windows DNS servers option above, MDaemon will also query all DNS servers found within your Windows TCP/IP configuration. Finally, at startup the System log will display each DNS server and indicate its source (i.e. manually configured or taken from Windows).

If you disable the option "Use Windows DNS servers", remove all of the manual entries from the DNS server list, and manually enter the IP address/addresses of the DNS server/servers of your ISP, does the issue you describe still occur?

If you disable the option "Use Windows DNS servers", remove all of the manual entries from the DNS server list, and manually enter the IP address/addresses of one of the free public DNS servers listed below, does the issue you describe still occur?

Best DNS Servers to Use for Free in 2018

https://www.macecraft.com/best-dns-servers-use-free-2018/