admob Mail PIN issues "There were problems sending your form. Please try again." Can't send address verifying form - forms

I requested a pin 3 times, but I did not receive a letter to my address. I think the reason for not coming is due to covid-19. Later the form link was opened(Contact Support). I get an error after filling out the form. "There were problems sending your form. Please try again."

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Sendgrid emails getting deferred

All the emails which I sent via SendGrid is getting deferred. On the SendGrid Activity dashboard it shows the message. "554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means."
It used to work 3 months ago. For the past 3 months, there were only very few email being sent out. Now All the emails sent are getting deferred.
Please let me know a fix for this.
Thanks in advance
I think I figured it out. I'm using shared hosting of SendGrid, so the server is being used by others as well. Go to the activity overview, and click the info icon. You will see more information, in my case it's like:
...Client host [149.72.39.137] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/149.72.39.137...
If you click the link, you can see the reason:
So here it's obvious that some phising was going on, therefore, mails are delayed and/or blocked.
I guess to solve this, we should upgrade to have a dedicated server...

Mail delivery failed :returning message to sender

I got this bounce back email whenever try to send to a specific sender..
Any help would be appreciate..Thanks :D
mail content:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
example#example.com.mm
No Such User Here
Reporting-MTA: dns; mail.example.net
Action: failed
Final-Recipient: rfc822;example#example.com.mm
Status: 5.0.0
Unless there is something odd going on, the bounce back message is clearly telling you that the email address "example#example.com.mm" doe not exist. Perhaps "No Such User Here" is not the best wording, but it means that the email address is non-existant.
Is the .mm at the end of the email address part of the problem? Are you actually sending email to Myanmar?
I have never seen this bounceback message when the email address actually existed. Since this is unusual, I would send the email headers to the ISP of the intended recipient, since it is highly likely that is where the problem exists, and ask them to investigate. Also, I do think that you can get the same message if the users Inbox is full. Ask the intended recipient about that.
the problem has to do with your websites DKIM and SPF keys (Email deliverability in CPanel), if they are not added to the server it cannot verify the authenticity of your email.
The best solution is to contact your server support or CPanel support to fix the issue. There is almost nothing you can do via programming.
I had this issue and I spoke to my server's support team and it was fixed
At this point my email deliverability has not been marked as VALID, so the email
Mail delivery failed :returning message to sender kept persisting.
so I spoke to the server support team as the tooltip in the image suggested and it was finally fixed
if you noticed the VALID mark there

Not receiving mail from domain mail-accounts

I am having a problem where i get a bounce whenever i send a mail to my email address xxx#mydomain.com, from xxx#anyotherdomain.com. I tested this with about 10 of my email accounts and none of them work.
However I am able to receive mails from accounts like xxx#hotmail.com or xxx#gmail.com.
I get this bounce :
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es)
failed:
However no error codes. If anyone can help me or point me at the right direction that would be appreciated.
You should see a more detailed error message below what you quoted. But I would check to see if you have an SPF record for either of the two domains and make sure it is set correctly.

Gmail blocked emails sent from Send Grid

We are trying to send mail on to Gmail account by using send grid api but Gmail has blocked the email which is sent from send grid. Please check the message given below:
550 5.7.1 [167.89.24.147 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for more information. kw15si11591084pab.218 - gsmtp
We have checked all header parameter suggested by Send Grid and implemented it in our code. At the same moment, it works fine for other domain like AOL, Rediff etc.
Please suggest how we overcome with this problem as we have huge users on Gmail and we will send our emails to all those users as. Also, we have noticed that the email came after some time from Send Grid.
Many thanks in advance.
The recipient mail server analyzed your message and determined that the content of the message is spammy. My recommendation would be to run your formatted message through a third-party service, www.mail-tester.com , to identify ways to improve the reception of the message. It's also possible that your sending IP address, 167.89.24.147 based on the response message you've included, is listed on a black list. You'll want to scan your sending IP on a site like http://multirbl.valli.org/ and, if you see that your IP is listed anywhere, submit a delisting request with the black list.
SendGrid also has a Spam Checker app - Turning on SendGrid's Spam Checker app can help combat this, as you're able to set a predefined filter and get alerted when your content exceeds the filter that you set.

Messages sent to Facebook returning with POL-P8

We have a desktop system that sends various e-mails to the users. These users have the option to choose to receive a copy of all these e-mails in his/her Facebook message inbox and we do this by sending a copy of the e-mail to the user's #facebook address.
For some time, this was working with no problems but recently a client reported that some of the messages sent to the user's Facebook address were failing and returning.
After analyzing the returned message, we found that the diagnostic code was "POL-P8":
554 5.7.1 POL-P8
http://postmaster.facebook.com/response_codes?ip=143.106.10.159#pol-m
Message refused (in reply to end of DATA command)
Looking at the code description page (http://postmaster.facebook.com/response_codes?ip=143.106.10.159#pol-m), we found that this particular code translates as "The message does not comply with Facebook's abuse policies and will not be accepted.", which seems to tell us that the message was considered spam and, therefore, not sent.
Still, we don't know exactly why this is happening. It doesn't appear to be related to the message content, since we tried manually sending an e-mail with the exact same content to the #facebook address and it was sent and received with no problems. We also thought that the problem could be caused by a large number of messages being sent to the user's inbox in a short period of time, but we also weren't able to reproduce this.
I did not find any detailed information about compliance to the "Facebook abuse policies" so I am a bit lost on what could be the problem and what could be done... any help someone can give me will be greatly appreciated!