Hi Sam,
soft error on the domain.
The Debian package "courier-mta-ssl is a transitional package and can be
ignored. This system is not new, but years old (more than 5). Nothing
recently been done to it other than fail2ban. However, I've checked both
with and without fail2ban services - no affect.
Before I posted, I checked mx and A record existence and could access
hosted server from telnet - from the same system as Courier.
The recipient domain is eagleofva.com
nslookup -type=mx eagleofva.com
Server: 75.75.75.75
Address: 75.75.75.75#53
Non-authoritative answer:
eagleofva.com mail exchanger = 20 eagleofva.com.2.0001.arsmtp.com.
eagleofva.com mail exchanger = 10 eagleofva.com.1.0001.arsmtp.com.
nslookup eagleofva.com.1.0001.arsmtp.com
Server: 192.168.1.13
Address: 192.168.1.13#53
Non-authoritative answer:
Name: eagleofva.com.1.0001.arsmtp.com
Address: 8.31.233.64
Checked above on another computer outside of the courier server system -
same results.
telnet 8.31.233.64 25
Trying 8.31.233.64...
Connected to 8.31.233.64.
Escape character is '^]'.
220 server232.appriver.com ESMTP srv-y
ehlo <courierserver>
250-inbound.appriver.com we trust you <courierserver>
250-DSN
250-SIZE 104857600
250-STARTTLS
250-ETRN
250-TURN
250-ATRN
250-NO-SOLICITING
250-8BITMIME
250-HELP
250-PIPELINING
250-SMTPUTF8
250 EHLO
Telnet to dns produces same result.
On 1/7/21 7:59 PM, Sam Varshavchik wrote:
Greg Pfister writes:
System: Debian 4.19.0-6-amd64 (Buster 10)
Courier (mta): 1.0.6-1
Courier mta ssl: 0.76.3-5+de
I don't know what this means. There is no "courier mta ssl" package.
Both 1.0.6 and 0.76.3 look like version of courier, with 0.76 being
quite old. But I, presume, you only have one version installed.
Any help would be appreciated.
I know I'm missing something, but since I'm able to telnet send an
email FROM the courier server to one of the servers in question, I
think it must be a courier issue. Could be wrong - been known to
happen.........rarely.
Use the testmxlookup command to make DNS MX queries using Courier's
resolver.
Prior to 1.0.10 a domain with a malfunctioning DNS server that fails
IPv6 queries would result in this behavior, even on IPv4-only senders
and recipients.
See what dig comes back with when querying the MX hostnames for AAAA
records.
dig eagleofva.com mx
; <<>> DiG 9.11.5-P4-5.1+deb10u2-Debian <<>> eagleofva.com mx
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17283
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;eagleofva.com. IN MX
;; ANSWER SECTION:
eagleofva.com. 3600 IN MX 20
eagleofva.com.2.0001.arsmtp.com.
eagleofva.com. 3600 IN MX 10
eagleofva.com.1.0001.arsmtp.com.
;; Query time: 46 msec
;; SERVER: 75.75.75.75#53(75.75.75.75)
;; WHEN: Thu Jan 07 21:11:34 EST 2021
;; MSG SIZE rcvd: 118
dig eagleofva.com.1.0001.arsmtp.com
; <<>> DiG 9.11.5-P4-5.1+deb10u2-Debian <<>> eagleofva.com.1.0001.arsmtp.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54906
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 5
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 03de54456e6c248571806bd05ff7c1ebcfd04c17b18547c0 (good)
;; QUESTION SECTION:
;eagleofva.com.1.0001.arsmtp.com. IN A
;; ANSWER SECTION:
eagleofva.com.1.0001.arsmtp.com. 588 IN A 8.31.233.64
;; AUTHORITY SECTION:
arsmtp.com. 42119 IN NS mdns2.appriver.com.
arsmtp.com. 42119 IN NS mdns1.appriver.com.
;; ADDITIONAL SECTION:
mdns1.appriver.com. 42119 IN A 162.159.24.198
mdns2.appriver.com. 42119 IN A 162.159.25.100
mdns1.appriver.com. 42119 IN AAAA 2400:cb00:2049:1::a29f:18c6
mdns2.appriver.com. 42119 IN AAAA 2400:cb00:2049:1::a29f:1964
;; Query time: 0 msec
;; SERVER: 192.168.1.13#53(192.168.1.13)
;; WHEN: Thu Jan 07 21:22:35 EST 2021
;; MSG SIZE rcvd: 241
resent to list
--
Greg Pfister
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