The better option, of course, was to see if there was a way to trick the client into reading from S3. One option, of course, is to do this in two steps: read in the S3 object and use Tempfile to write a file which can then be used as the attachment. If you need to send higher number of emails up to 1,000,000 then you can contact the sales team of MailGet SMTP. An additional feature that deserves mentioning is their automation, enabling innovative automated campaigns based on triggers/conditions such as sales or even location. We were essentially down on all our websites, as a website that cannot collect leads or sales is a very expensive brochure. For one thing, I’m running stuff on Heroku, and try to avoid using the file system even for temp files. By default, the name of the attachment is the name of the file, which is pretty ugly if you use a temp file. When a mail client or server is submitting an email to be routed by a proper mail server, it should always use this port. As a result, deciding to offload transactional mail when developing Zoetic was a no-brainer. In this tutorial, we’ll walk you through how to fix email delivery issues by sending WordPress emails with Mailgun using WP Mail SMTP. Some of the plugins that you are using may have a function to test sending email. Click on Create Function. Click on it to display its edit page.
Click here to enlarge the image above. However, for many ‘high-profile’ domains it actually triggers automatic spam/phishing classification due to another standard: DMARC. DMARC allows domain owners to receive feedback on their email failure rates and also institute a hard-rejection policy for their domains so that providers like Gmail will treat DKIM fails as definite indicators of spam/phishing. As mentioned earlier, Mailgun allows you to create multiple domains. This allows the recipient to check the signature and ensure the email is authentic (i.e. sent from a server that the domain allows). This is a problem because while not clearly defined by the standard, having a duplicate header means the existing signature fails because the recipient does not know which X-Feedback-Id was signed, and the new one will fail. The combination of DKIM failing and DMARC policies means that the originating domain and mailserver will be seen to be sending phishing emails and therefore over time be classified as such (see Google’s Best Practices: Authentication). What this means for us is that now our legitimate outgoing email sent by our domain is being sent straight to spam as Gmail has classified us as a phishing domain. The problem is, if you’re using Mailgun right now to forward your email to Gmail or another destination, it’s not always done right. This isn’t a problem for me because the files I’m dealing with aren’t very large, but it’s something I warn about in the comments. Using RestClient to send the emails, the expectation is that attachments are files.
However, the expectation is that a company focused on email would be experts in email and get it right. I love Mailgun — I have had the experience of working for an email company before, and I know email is hard to get right. So why is DKIM failing (sometimes) with Mailgun forwards? While having DKIM authentication fail does not automatically mean that an email will be classified as spam, it is a strong indicator. In addition, we determined it was not misconfiguration of the origin email domain because emails not passing through Mailgun were not being classified as spam, and this was happening across many well-known email domains. Many mailing lists already include this header (including all Mailchimp emails), and it turns out that without regard to this, Mailgun prepends its own X-Feedback-Id header, even in cases where this header is already DKIM signed by the origin. This forced me to write a crude sort of buffering ” the wrapper reads the whole S3 object in, then hands out chunks of it when asked. It turns out it is because of the ‘X-Feedback-Id’ header. As it turns out, using the aws-sdk gem, S3 objects don’t quite behave like files, so it doesn’t work to simply toss the S3Object instance into the call. The way the Mailgun webhooks work is different from how the Sendgrid webhooks work. This solution does not work (Laravel 5.4). I found out the hard way. At first I thought this was because Mailgun was appending and prepending headers to the email– which, as Mailgun support pointed out, is actually okay as long as there are no modifications to the existing header sets.