Unable to send email to all recipient - asp.net-mvc

Description:
I deployed our MVC application in Azure, in 2 different environment i.e. UAT and Production. And that MVC application have a functionality of sending email. While sending an email from UAT is got sent successfully but while sending from Production is throwing an exception i.e. Unable to send email to all recipient.
Code and configuration for both environment are same.

Try to send your email using of sendgrid on Azure. Azure support for it.
Follow below article it will be helpful.
How to Send Email Using SendGrid with Azure

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Bamboo Mailer & SES Failing to send an email to one specific user

I am working on a production server that sends roughly 1000 emails a day with almost no issues. There is a single email that always fails and I have been unable to send an email to this user through our system. The site is built with Elixir and uses the Bamboo Mailer, specifically the smtp_adapter but I believe this may be an issue with SES rather than our code or the Elixir libraries we are using.
The particular user always throws this error:
{{:nocatch, {:permanent_failure, "501 Invalid RCPT TO address provided\r\n"}},
From what I can tell the email address is valid and the customer has verified it as such and stated that emails have been sent and received to the user outside of our system.
I'm looking for some context on how SES determines what a valid RCPT TO address is and more generally how SES works to send emails. I haven't been able to find much on this issue from the SES docs.

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I am trying to learn the ins and outs of Mandrill, so I created a test app that has no functionality except creating users, signing them in and out, and clicking on a link that sends the user an e-mail through ActionMailer.
So far all of this works fine. I have configured Mandrill to send e-mail in both development and production (Heroku). What I'm trying to do now is configure it to receive e-mails sent from users and do stuff with them. My problem is that I'm not sure what to add as my mail domain in the Sending Domains section of my Mandrill account page.
I've done this before with an app on Heroku using Mailgun. Mailgun gave me a Mailgun subdomain to use for user testing off the bat (app12345678.mailgun.org). I was able to send mail to postmaster#app12345678.mailgun.org and it worked perfectly. With Mandrill it's proven a bit more difficult.
Mandrill doesn't seem to provide a Mandrill subdomain to start with. I suppose my question is: is it at all possible to get a Mandrill subdomain for testing like the one Mailgun provides? If not, how can I go about user testing inbound e-mail with Mandrill if I don't currently own my own custom domain? What can I use as the Sending Domain?
it's not currently possible to use Mandrill's inbound email routing unless you have a domain/subdomain to work with. We don't provide a testing subdomain to use for inbound routing.
Any domains you actually send from in Mandrill will be added to the Sending Domains page. You don't have to manually enter any domains there, since we'll detect any that you use and show them there automatically. If you want to set up SPF and DKIM for your sending domain, you can manually add it in order to validate the records have been added correctly.
If you have other questions specific to your account, our support team is also happy to help if you want to get in touch via the Support button in your account.

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Any ideas without getting too deep into code modification?
The simple answer is no, or rather it is far from easy, especially from a home based server.
And the reason is that your IP address amd mail server domain will not be considered as a ligitimate mail server by most of the legitimate mailservers you will be trying to send mail to, and they will just reject it as yet another spam server.
Have a look at these:
https://serverfault.com/questions/72559/setting-up-a-mail-server-best-practices-to-be-recognized-as-legitimate
How to conduct legitimate email campaigns

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I am Using Jenkins v1.521 on Windows 2008 R2 server. I need to enable email build notifications in the builds. I have also installed email ext plugin.
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I tried sending the test email from Jenkins using "Test Configuration" option providing my email address and I get a message that says "Email successfully sent" but I don't seem to be receiving the email.
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Could any one please provide me suggestions to fix this issue?
In order to get this to work, a valid email must be entered into the "System Admin e-mail address" field. That field is on the same page but is located in another section higher up. Without doing so, I too received a message that the email was successfully sent but I never received it. Once I set it, the test emails started to be received properly.

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i'm searching for a way to send emails with ruby on rails via actionMailer. The difficulty is, that i am sending the emails via gmail smtp. But i have to send them from different email-adresses (the customers have to be able to setup there own email adress, but i dont want to save the credentials).
Any Idea?
Thanks"!
you have to setup a mail server to send your mails for you and you just send the mail with the headers saying that it is from the person's email address. there are many mail servers, sendmail being one of the standards for a VPS. if you pick a service like heroku, they have mailing as an addon: http://addons.heroku.com/sendgrid

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