Google Postmaster Tools DKIM issue - email

Looking at my domain in Google Postmaster Tools, I can seem that the DKIM success rate is 0%. This despite doing tests on any 3rd party platform, such as MX Toolbox, Mail-tester.com and others, confirm the DKIM has been set up correctly. I experience bad IP and domain reputation on this sender, which I am concerned comes from this authentication issue.
Emails are btw. being sent out through whitelabeled SendGrid setup.
Any suggestions?
Thank you
Brdgs
Lukas

This was caused by me adding the subdomain (marketing.example.com) to the Postmaster Tools. Adding the top domain (example.com) solved the issue.

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email crash after domain transfer

I'm helping a friend to migrate a website to his server, however, after the domain transfer the client's emails stopped working. I believe their email was hosted on cPanel with the old provider. What does he have to do to get the emails working again? The old service hasn't been terminated yet.
With the limited information I would recommend looking into the following.
Verify the MX records are set correctly.
Verify any subdomains they are using for example mail.domain.com or imap.domain.com etc are still pointed to the proper email server. Can verify old DNS records on previous domain server.
I would also look into the error the mail client is getting. For example is the error an auth error, server not found or something else.
You can use online tools such as https://mxtoolbox.com/ to verify that the dns records are correct.

How to install mail server on vps (digitalocean)

I need send and receive e-mails. I need configure on Digital Ocean Vps a Mail server.
I need a how to or any recommendation about it. I think I will have to create a database to store messages.
I have seen:
Mailgun: I have created an account and created dns records Mx and Txt but Its not verified yet. So I can't receive email.
SendMail: I think it's I have already installed but I don't know how to send and receive email from hello#domain.com
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Thanks.
Mailservers are complex beasts of software. Installing your own might be a bad idea, unless you're willing to invest time to
make it secure
protect it against spam and viruses
back up your emails
understand topics such as DMARC and TLS and greylisting
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See why you may not want to run your own mail server for more information.
Maybe you could use an email provider instead? Google Suite is a great choice :)
There's an open-source solution
Mail-in-a-Box lets you become your own mail service provider in a few easy steps. It’s sort of like making your own gmail, but one you control from top to bottom.
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I'm somewhat new to this problem so sorry if this is an obvious question. I am building a website for a client which is hosted on Heroku. The client previously had the old website hosted on HostGator. The Domain name was purchased from GoDaddy. The client has a custom email domain (ex. #client.ca). Today I transferred the new website domain from HostGator to Heroku, and everything seems to be working well except the emails. The "#client.ca" emails no longer work. From what I gather, I have to point Heroku towards the Host Gator IP Address in order for the emails to work. I'm not exactly sure how to do this. Does anyone have a solution for this? Thanks!
You need a DNS service like dnsmadeeasy or others mentioned on heroku. From there you need to distribute the different records, e.g. ANAME and CNAME to heroku, CNAME to external asset hosts like cloudfront, MX (and A) to email host.
Am myself in the process of dealing with the "email problem":
(easier) The registrar (domain name provider) offers email hosting, but does not offer ANAME or ALIAS records (common): You can point the nameservers to the DNS service and then point the email back to your registrar. Found registrars quite helpful in general with helping if you need config details.
(more annoying) The registrar does not offer email hosting in the first place or has an all or nothing policy re nameservers (everything with them, or nothing with them, like e.g. easily). In this case you have to find an independent email host. Any recommendations? The setup is analogue.
(perfect) Your registrar offers ANAME or ALIAS records and email hosting. Lucky you!

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When messing around with different mail hosting options I noticed a very aggravating pattern with my Android phone. Neither the built-in mail app nor the gmail app supported email auto-configuration.
When using most mail services such as Namecheap, Zoho, Rackspace, etc. this became a real issue. I would enter my email address and password then instead of it just working like magic, it would invariably fail as it attempted to set the mail server to mail.example.com instead of mail.privateemail.com or smtp.zoho.com
I can configure a CNAME entry for my domain to redirect to these servers and successfully connect to mail.example.com.... up until I try to enable secure e-mail (STARTTLS or TLS wrapper). When I do this the domain name on the certificate does not match up to the domain name I am using to access and the whole thing fails.
Of course setting up my own mail server could be an option, but it could take months or years for my IP address to build up enough reputation to not get auto-blocked by major providers like Gmail or Yahoo. This whole past month DreamHost has been unable to send emails to any address owned by AT&T, which has been nightmarish to get resolved. Not wanting an issue like that, I would like to go with a big name for e-mail hosting.
While looking into Amazon SES to see if it would be easy to set up, I noticed this page on secure tunnels to AWS SES
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I am using Contact Form 7 with Wordpress, but I am experiencing an email compatibility issue.
I have the form setup to email to email#domain.ca, domain.ca being the domain of the website hosting the site. The email address exists and works great, however the Contact Form keeps failing on send.
If I change the email address to any of my Gmail or other accounts, it works fine.
I am looking for ideas or suggestions as to how I might debug this. Is it because the site is hosted on a shared hosting server but the mail server is in-house at the physical location?
Any ideas would be great.
Ended up being an MX Entry problem with the shared host.
I had to set the MX Entry to send mail to an external host instead of the internal mail servers (it didn't realize the mail server was external).
Problem solved and all is well.
EDIT: We have run into this issue multiple times now with the hosting.
Essentially, cPanel gives you an option to say that mail servers are external, but it often fails to deliver on actually making the change. We have to remove the mail servers and hardcode the external one in order to make it work properly and consistently.
Might be php or smtp mail restrictions at your hosting service. Try http://wordpress.org/extend/plugins/wp-mail-smtp/