Hi
I am sorry, standard ports 25 and 110 can be insecure or secure using StartTLS (see below for standard SMTP test using port 25)
If anyone is using our platforms, you will be on haveworx.co.uk and to avoid any SSL error on email, we always advise to use mail.haveworx.co.uk for incoming/outgoing servers for all services, and leave as default ports in client software (port 465 is usually not used any longer and SMTP ports are 25 and 587 - some may still allow 465 though) We use SMTP 25 and 587 only on this platform.
If anyone is wondering why I have left/quoted full domain/IP, it is a live platform and has been scrapped many times, so no need to hide.
@tickmike, I would email your ISP support for full clarification, as most allow connections from any networks as we do and you would be advised not to use any mail relay services.
Many thanks
John
Confidence Factor for "haveworx.co.uk": 100
MX Server Pref Answer Connect HELO TLS Cert Secure From
mail.haveworx.co.uk
[5.153.90.157:25] 10 OK
(75ms) OK
(2,095ms) OK
(74ms) OK
(75ms) OK
(419ms) OK
(75ms) OK
(379ms)
Average 100% 100% 100% 100% 100% 100% 100%
Checking haveworx.co.uk:
Looking up MX hosts on domain "haveworx.co.uk"
•mail.haveworx.co.uk (preference:10)
Trying TLS on mail.haveworx.co.uk[5.153.90.157:25] (10):
seconds
test stage and result
[000.075] Connected to server
[002.170] <-- 220 ns1.haveworx.co.uk InterWorx-CP SMTP Server Ready ESMTP
[002.170] We are allowed to connect
[002.171] --> EHLO www6.testing
[002.244] <-- 250-ns1.haveworx.co.uk InterWorx-CP SMTP Server Ready
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-STARTTLS
250-SIZE 52428800
250-PIPELINING
250 8BITMIME
[002.245] We can use this server
[002.245] TLS is an option on this server
[002.245] --> STARTTLS
[002.320] <-- 220 ready for tls
[002.320] STARTTLS command works on this server
[002.484] Connection converted to SSL
SSLVersion in use: TLSv1_2
Cipher in use: AES256-GCM-SHA384
Certificate 1 of 3 in chain: Cert VALIDATED: ok
Cert Hostname VERIFIED (mail.haveworx.co.uk = haveworx.co.uk | DNS:ftp.haveworx.co.uk | DNS:haveworx.co.uk | DNS:mail.haveworx.co.uk | DNS:www.haveworx.co.uk)
cert not revoked by CRL
cert not revoked by OCSP
serialNumber=04:50:31:a6:d3:17:2d:54:f1:08:a5:48:db:3c:87:50:7d:7f
subject= /CN=haveworx.co.uk
issuer= /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
Certificate 2 of 3 in chain: Cert VALIDATED: ok
cert not revoked by CRL
cert not revoked by OCSP
serialNumber=0a:01:41:42:00:00:01:53:85:73:6a:0b:85:ec:a7:08
subject= /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
issuer= /O=Digital Signature Trust Co./CN=DST Root CA X3
Certificate 3 of 3 in chain: Cert VALIDATED: ok
cert not revoked by CRL
cert not revoked by OCSP
serialNumber=44:af:b0:80:d6:a3:27:ba:89:30:39:86:2e:f8:40:6b
subject= /O=Digital Signature Trust Co./CN=DST Root CA X3
issuer= /O=Digital Signature Trust Co./CN=DST Root CA X3
[002.739] ~~> EHLO www6.testing
[002.814] <~~ 250-ns1.haveworx.co.uk InterWorx-CP SMTP Server Ready
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-SIZE 52428800
250-PIPELINING
250 8BITMIME
[002.814] TLS successfully started on this server
[002.814] ~~> MAIL FROM:<test@testing>
[003.193] <~~ 250 ok
[003.193] Sender is OK
[003.193] ~~> QUIT
[003.267] <~~ 221 ns1.haveworx.co.uk InterWorx-CP SMTP Server Ready