topic Migration to Greenby Outlook Receive Yes Send No in Email

Migration to Greenby Outlook Receive Yes Send No

KAD1 — Thu, 19 Mar 2026 14:51:42 GMT

I'm very new here and at my wits end.

Since migration to Greenby, I cannot send email from Outlook Classic. Incoming mail is working both on Greenby Webmail and Outlook. However, I cannot send from Outlook. I can send from my iPhone with no issue.

Greenby support is less than useless. After passing the BOT you get someone who comes and goes for hours on end with no solution.

Can anybody please help me. I am at my wits end this has been going on for two weeks now. I really don’t want to have to change from using Outlook.

I've tried all of the ports they suggest but still to no avail.

Settings I am being told to use in various guises are:

Incoming Mail

Email ******

Password ******

Server mail.plus.net

Port 110

Unchecked Both SSL/TLS and Requires Authentication

Outgoing Mail

Mail.plusnet.enmail.co

Port 25

SSL/TLS set to None

Checked Box My Outgoing SMTO Server requires authentication

Many thanks in advance.

Re: Migration to Greenby Outlook Receive Yes Send No

Baldrick1 — Thu, 19 Mar 2026 16:04:32 GMT

Moderator's note:
Thread moved from Everything Else to Email

Re: Migration to Greenby Outlook Receive Yes Send No

Dan_the_Van — Thu, 19 Mar 2026 16:54:11 GMT

@KAD1

Outlook has picked up the wrong settings

I use these setting for free-online, (modified for plusnet email) which includes encryption.

Incoming

IMAP: imap.plus.net

port 993

encryption SSL/TLS

Outgoing

relay.plus.net

port 587

encryption STARTTLS

Re: Migration to Greenby Outlook Receive Yes Send No

Dan_the_Van — Thu, 19 Mar 2026 17:37:04 GMT

I provided IMAP settings, see you are using POP3

POP3: mail.plus.net

port 995

encryption SSL/TLS

Apologies

Re: Migration to Greenby Outlook Receive Yes Send No

stocc — Thu, 19 Mar 2026 17:56:29 GMT

Hello KAD1,

My plusnet mailboxes were moved to Greenby 23-Feb-2026.

I had no problems sending and receiving emails to and from plusnet addrs and Outlook addrs until 9-March. I could not send emails from plusnet addrs to Outlook addrs.

"Mail delivery failed: returning message to sender" email from Outlook

"Please contact your Internet service provider since part of their network is on our block list (S3140)" and "...block list (S3150)"

I went through the Greenby Chat too. I was told to use IMAP port 143. POP3: 110. SMTP: 25. SSL/TLS = disabled. Connection Security = None.

I was also told that Greenby "... are aware of issues with delivery specifically relating to DKIM. This can result in emails being flagged as spam or failing to be delivered to providers like Outlook.com and iCloud.

We are working closely with BT to resolve this as quickly as possible. We are aiming to have this solved within a week, but we cannot be more accurate..."

...

My temporary 'fix' (which has worked so far) is to change my Outgoing Server settings to:

relay.plus.net

Port 25

Connection security: None

Authentication method: Password, transmitted insecurely

...

My problem is not the exact same problem that you are having as I use Thunderbird as a client. Hopefully it can help.

Re: Migration to Greenby Outlook Receive Yes Send No

jab1 — Thu, 19 Mar 2026 18:30:25 GMT

@stocc (and others) ports 25/143 are not correct (even if they work) and the advice you were given - and is also given in the Greenby (not)helpful FAQs should be disregarded.

I have also been migrated to Greenby and my POP3 settings (which work) are: SMTP: relay.plus.net on port 587 with encryption STARTTLS

Re: Migration to Greenby Outlook Receive Yes Send No

stocc — Thu, 19 Mar 2026 18:44:20 GMT

@jab1 I would normally agree with you. However, using port 587 and with encryption STARTTLS for the Outgoing settings Outlook were blocking emails from plusnet. As a temporary 'fix' I had to use port 25 and Connection security as None to be able to send emails to Outlook addrs. When Greenby/BT fix whatever is causing this issue then I will revert back to port 587 and STARTTLS.

Re: Migration to Greenby Outlook Receive Yes Send No

jab1 — Thu, 19 Mar 2026 19:00:47 GMT

@stocc Personally, I don't think it is a Greenby/PN issue - I use Thunderbird and am having none of those issues, using ports 587/995 and encryption

Re: Migration to Greenby Outlook Receive Yes Send No

KAD1 — Thu, 19 Mar 2026 19:37:48 GMT

Sadly none of the above or below is working for me. Every combination has failed. I can still receive but not send 😞

Re: Migration to Greenby Outlook Receive Yes Send No

jab1 — Thu, 19 Mar 2026 19:49:40 GMT

@KAD1 Sorry none of it works for you, and I'm afraid I cannot help further -I haven't used any flavour of 'Outlook' for probably 25 years, so have no idea of its capabilities/habits.