SendGrid does not send emails to Outlook - outlook

I just started to using SendGrid in my c# application, and actually I tested this with Gmail without any problems, so I tried to send an email also to an Outlook email but unfortunately I never reiceved it, I looked also in the spam folder but there is nothing.
I suspect that Outlook or SendGrid are blocking the localhost:8081 sender (which actually my application runs).
How can I fix this?

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PHPMailer thread/conversation in outlook not working

I've achieved the "conversation/thread" effect in gmail, using this code
$phpmailer->MessageID = $message_id;
and with this, in gmail all e-mails sent (with the same value in $message_id) are received in the same "conversation/thread", but this dont work in outlook, both windows 10 email app and outlook app for windows 10...
How can i achieve the same result as in gmail in outllook?
Don't re-use the same message ID for multiple messages. There are headers specifically for creating threads, and the definitive explanation for them is here. In short, add the Message-ID of the message you are replying to in a References header, and optionally also into an In-reply-to header. You can create those headers in PHPMailer using addCustomHeader().

How to get emails directly without storing in webmail inbox?

I am facing problem regarding Outlook app. I have successfully connected webmail with outlook app, but when I delete email from Webmail then it also delete from Outlook. I don't want to delete from my ourlook app. It should keep it for my record.
One of my friend told me that he is getting mail directly from the sender to outlook app without storing a single mail on webmail server.
How can I customize settings to get my issue resolved?
If mail connection is IMAP, a delete will remove the mail everywhere.
If mail connection is POP3, it will not.

Mails sent using javamail aren't found in the sent folder of Outlook

I am using javamail for Sending mails using Office365 account. I couldn't find the sent mails in the sent folder of my outlook. Interestingly, I could find the mails in sent folder if I use EWS for sending mail. What am i missing here?
Currently, messages sent though Office 365 SMTP are not copied to the Sent Items folder.
That might change in the future.

Duplicate emails being produced only through Outlook via Laravel App

We are using a web application to send out mail. Email is sent and received as expected on a server level and in GMail. However, when messages are pushed to our client's Office365 (Outlook), instead of getting one copy they are getting duplicates.
This is how the app works. You can send emails to a number of people (1,5,20, etc). It's all the same message, subject, etc. It's the same email.
The app sends you a copy. Just one. That's how it is supposed to work. Within their Office365 (Outlook) email account, they get their one copy, and then another copy for each recipient (that's not supposed to happen). So, if you email 5 people, instead of getting one email back, they get 6.
The thing is, this program has run flawlessly for nearly a year. Out of the blue, this glitch started happening.
We have had no code changes, no vendor updates, or anything of the sort on the web application side of things that would trigger since before the time this glitch started happening. When we tested locally, and on the live server, with GMail credentials, the app continues to work as it should.
We are sending out mail via SMTP.
The security protocol is "tls".
https://laravel.com/docs/5.5/mail that describes the core Laravel mail function we are using to send out mail.
The client contacted Microsoft support -- who basically said "I don't know. Not my problem".
I don't know where else to turn, or what other steps to take to debug.

form to mail not getting to exchange server recipient

this is terrible for me now. i used php mail function and also use Contact Form 7 plugins too on my wordpress theme. also smtp plugins too. change many smtp server. but not work. mail function and Contact Form 7 both working fine on other mail account (gmail, yahoo. hotmail or any other pop mail) not just my client pop account. because they use microsoft exchange server.
for test issue i did something like i sent mail to frist to one gmail account and i setup in gmail auto fwd to one them that pop account . it working well but this problem is in mail show where it is from (xxxx#gmail.com) .. i don't want to show that gmail address. or i want direct send to that pop account.
server is godaddy
guys any solution ?
Google doesn't allow you to send from other addresses unless you are hosting your domain with them.

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