re :YESTERDAY, I SENT AN E - MAIL, TO THE COURTS, = @justice.gov.uk , THIS E - MAIL, WAS, "REJECTED", AND MARKED AS, "UNDELIVERABLE",

It is probably undeliverable because it does not exist.

On this webpage : https://www.justice.gov.uk/ It mentions that the website is moving and redirecting to: https://www.gov.uk/ So it will cease to exist. So, it is possible the email address does not exist and cannot be delivered.

Dear Toad-Hall,

Thanks for the quick reply.

SORRY, but I have been away, hence my delay to reply...

I do not think, you have grasped my problem, Toad-Hall, can you, please, re read, my first Problem Question ?

As to your Answer = 7/28/21, 8:35AM, My Problem, IS NOT, Sending an e - mail, to the, "justice.gov.uk".

         It  just  so  happens,  that  it  was,  AT  THAT  TIME,  that  I  Noticed,  that  I  Found  Out,

that, "I", had a Problem... = I was able to, send, an e - mail, to the, "justice.gov.uk", by using, the Online, Web Page, for "OUTLOOK". = I then, DID RECEIVE, a reply, from, "justice.gov.uk", in which, "THEY", Confirmed, Receipt, of my e - mail = "justice.gov.uk", does, "exist".

My Problem, is that, I am having trouble, sending e - mails, and, "self test, e - mails", through, "THUNDERBIRD".

My Problem, is that, my e - mails, and my, "self test, e - mails", are being, REJECTED, by "OUTLOOK".

I can send, e - mails, directly from the Online Web Page, for "OUTLOOK", and these, if addressed to me, are then, Received, by, "THUNDERBIRD".

"THUNDERBIRD", on its own, does Receive, e - mails, as sent, from other people.

Thanks for your time, again, Toad-Hall.

Yours.

The reason emails are being rejected is therefore because you are adding your own outlook email address to the Cc or even a TO field if testing separately. That email is being sent via the outlook smtp server because you are using a third party client. If sending via outlook webmail, it is not being sent via that same server because you are already logged onto that server.

In a nutshell Outlook are blocking your emails when sending to yourself. This is not unique to you. Outlook are a pain and are well known for doing this. It is not a fault with Thunderbird.

I found a case - back in 2015 - which used a workaround to fix things and seems to have helped other people - so worth a try: https://answers.microsoft.com/en-us/outlook_com/forum/all/cant-send-email-to-myself-anymore/834300d2-a9d2-498f-83c7-8f97da371546

This issue you mention has occurred in the past and they/outlook/microsoft fixed it: https://answers.microsoft.com/en-us/outlook_com/forum/all/emails-from-myself-are-being-blocked/0804ee44-b610-4ade-9e84-e577bfc2a8dc

But maybe it is occurring again because I have seen reports of others reporting same problem. It would be worth checking out the outlook forum. https://answers.microsoft.com/en-us/outlook_com/forum/all/

Others do mention issues regarding failures when sending to self.- This particular one is more current and has many people like yourself, so would be worth adding your case as sometimes it gets the attention of the powers that be.

• https://answers.microsoft.com/en-us/outlook_com/forum/all/sending-myself-emails-and-receiving-remote-server/f5ad8747-2a8d-440e-9f5d-316531b25802

• https://answers.microsoft.com/en-us/search/search?SearchTerm=Sending%20myself%20emails&tab=&status=all&advFil=&IsSuggestedTerm=false&isFilterExpanded=undefined&CurrentScope.ForumName=outlook_com&CurrentScope.Filter=oemail&ContentTypeScope=&page=1&sort=Relevance&dir=Desc&from=threadpagesearchbar

Other similar: https://answers.microsoft.com/en-us/outlook_com/forum/all/emails-to-self-not-being-sent-because-content/c04c5fe8-877d-416e-8a2c-b69504916ac6 https://answers.microsoft.com/en-us/outlook_com/forum/all/query-unable-to-send-emails-to-myself-hotmail/9c83b770-d9e8-4fe6-8c30-bec3f8c92870 https://answers.microsoft.com/en-us/outlook_com/forum/all/outlookcom-rejects-mail-that-i-send-to-myself-from/7f6ea32a-83c8-4c42-8ae0-a923d25d7d69

Dear Toad-Hall,

Thanks for the swift reply. I am mindful to say, "thanks", due to my being on Holiday, before, and thus, my delay, in acknowledging, your first, reply.

When I am doing a, "self test", I am only sending an e - mail, to myself, = sending an e - mail, from outlook.com = and that e - mail, being sent, to the same, outlook.com, e - mail address. = I have not been using, "CC" = in an, "important to me", e - mail, I send it to the person, that I am communicating with, and also, address, the e - mail, to myself, ( in the "TO", addresses ), to, "prove", that "I", have sent an e - mail.

Thanks for confirming, that the Fault, is not, with, "THUNDERBIRD".

With my logic, "I", thought that it was, "OUTLOOK's", Fault... BUT, As I am, "not", an Expert, it is nice to have an Expert, think the same as me. Thanks again.

In your 2nd reply, you have given me a lot of, "homework", to look into. I will start looking at the suggestions, tomorrow.

Again, thanks for your time and help, Toad-Hall.

Yours.

Dear Toad-Hall,

Further to recent reply.

I have now, had time, and have, been through the Links, the Suggestions, that you sent, and "tried them", as advised. However, they did not work...

I still have the same problem, and it seems, "intermittent", when sending to "other people", = sometimes it works, and sometimes not...........

I still try to send, "self tests", when I am on the Desktop Computer, but all, still are, "rejected", by OUTLOOK, and thus, unable to send, from THUNDERBIRD.

I have, Cut and Pasted, your last reply, to MICROSOFT OUTLOOK, and they, "still have not", Replied, Responded.... = no real surprise there.

I have also, Added, my Problem / Fault, to a MICROSOFT COMMUNITY GROUP, as you suggested, Toad-Hall.

So thanks for your time, and advice, AGAIN, Toad-Hall.

It did not, fix the Problem / Fault, but at least, YOU, Toad-Hall, were able to, prove to me, that the Problem / Fault, lies with, OUTLOOK, and "not", THUNDERBIRD.

All the best. Yours.

Dear Toad-Hall,

UPDATE ON SITUATION -

NOTING - that I have done, "NOTHING", that I have, "CHANGED NOTHING", within, THUNDERBIRD...

In the past days, I have received, Update e - mails, from the, Microsoft Community, saying that, "THINGS HAVE CHANGED", and that, "NOW", They Can, send, SELF TEST, e - mails, which are then / now, received in THUNDERBIRD.

 =  I  am  also,  now,  able  to,  send,  SELF  TEST,  and  have  done  so,  for  the  past,  few  days,  now.
 =  MICROSOFT  OUTLOOK,  have  obviously,  "CHANGED  SOMETHING",  and  now,  it  appears,  that  OUTLOOK,  is  no  longer,  "rejecting  as  Spam",  our  SELF  TESTS.

I am just, stating this, so that it shows, Full Circle, on my First, Question, for HELP, which was replied to, by you, Toad-Hall.

Again, thanks for your time.

Yours.

Check also if automatic encryption and attach public key are enabled in account settings.