A basic question I couldn't find an answer to: If I use cloudflare email routing with the domain `my

A basic question I couldn't find an answer to:
If I use cloudflare email routing with the domain

mydomain.com

mydomain.com

mydomain.com

mydomain.com I can't have another MX record. So I route a mail from

mail@mydomain.com

mail@mydomain.com

mail@mydomain.com

mail@mydomain.com to

mail@secretdomain.com

mail@secretdomain.com

mail@secretdomain.com

mail@secretdomain.com. Now if I want to answer that mail, is it possible to use

mail@mydomain.com

mail@mydomain.com

mail@mydomain.com

mail@mydomain.com as the sending address, so no one sees the

secretdomain.com

secretdomain.com

secretdomain.com

secretdomain.com address?

BBen Seitz A basic question I couldn't find an answer to: If I use cloudflare email routing...

rdm•5/26/24, 3:28 PM

If you have an outbound provider that gives you like SMTP where

mydomain.com

mydomain.com

is setup properly, sure.

Rrdm If you have an outbound provider that gives you like SMTP where `mydomain.com` i...

Ben SeitzOP•5/26/24, 3:46 PM

But how can I set it up, if no other MX records are allowed?

BBen Seitz But how can I set it up, if no other MX records are allowed?

Hello, I’m Allie!•5/26/24, 3:48 PM

MX Records aren't used to send email

Hello, I’m Allie!•5/26/24, 3:48 PM

You don't need any records to send on behalf of a domain. You should add SPF, DKIM, DMARC records to ensure the emails arrive/aren't thrown into Spam though

Ben SeitzOP•5/26/24, 3:51 PM

can you recommend a provider, that allows setting up outbound mail without setting up inbound mail and requiring an mx?

rdm•5/26/24, 11:13 PM

Amazon SES, Mailgun are two

noahluk•5/28/24, 4:28 AM

Hi, all, I am new to all these, I setup email routing, and I do receive testing email, but the timing is not consisitent, one I got it right the way, another testing takes a few minutes. and the one I am expecting now still have not show up after 10 mins? I am using gmail as destination email address.

BBen Seitz can you recommend a provider, that allows setting up outbound mail without setti...

paulc•5/28/24, 3:22 PM

Cloudflare partners with MailChannels to provide email sending w/o having to manage MX nor set up SMTP account for sending. See https://blog.cloudflare.com/sending-email-from-workers-with-mailchannels . You can write a function that POSTs to MailChannels' API. Their API works great.

The Cloudflare Blog

Send email using Workers with MailChannels

MailChannels has created an email sending service specifically for Cloudflare Workers that removes all the friction associated with sending emails.

Unsmart•5/28/24, 3:27 PM

Mailchannels is removing that integration and shouldn’t be used anymore

Unsmart•5/28/24, 3:27 PM

https://support.mailchannels.com/hc/en-us/articles/26814255454093-End-of-Life-Notice-Cloudflare-Workers

Help Center

End of Life Notice - Cloudflare Workers

Since launching our free email sending API for Cloudflare Workers customers, we have been proud to provide a simple yet effective solution to deliver messages from Workers code with a minimum of se...

UUnsmart Mailchannels is removing that integration and shouldn’t be used anymore

paulc•5/28/24, 3:33 PM

Oh - thanks for the heads up!!! Bummer they're removing the free version

. Looks like anyone can still use it if they're on a paid plan with MailChannels.

Isaac McFadyen•5/28/24, 4:15 PM

If you're looking for a paid email service provider, I'd highly recommend avoiding MailChannels based on how they addressed (or rather, didn't address) the security issues in the past.

Isaac McFadyen•5/28/24, 4:16 PM

See https://canary.discord.com/channels/595317990191398933/779390076219686943/1226529017763463219 for more info.

BBen Seitz A basic question I couldn't find an answer to: If I use cloudflare email routing...

nonenal•6/4/24, 10:24 AM

if you reply to an email that got forwarded to your secretdomain.com it might still show up in the headers somewhere

richburdon•6/4/24, 4:44 PM

can anyone recommend another email service?

Unsmart•6/4/24, 4:47 PM

email service for what? Sending? AWS SES

richburdon•6/4/24, 5:14 PM

thanks @Unsmart -- yes for sending email -- we're currently using MailChannels, but really wanting to avoid AWS (that's why I'm here :). Looking at Mailgun.

Mmicha @Chaika Any idea if I would need to worry about the 10ms CPU time limit with tha...

Chaika•6/5/24, 3:12 PM

CPU Time is just the time the cpu is active, it doesn't include network time. You could do a fetch() which takes 10 seconds and only consume microseconds of cpu time

Chaika•6/5/24, 3:13 PM

Right, that's just handing it off to CF's smtp servers stuff to handle forwarding, that worker isn't doing anything, shouldn't be more then an ms or two of cpu time

Chaika•6/5/24, 3:20 PM

sure, yea you can do a ton of stuff within 10ms of cpu time, most ideas you can think of (rewriting websites with htmlrewriter, proxying requests, having a block list for emails, etc). It's not hard capped either/you have a bit of a starting pool to make up for the first few executions being slower.

Mmicha Seems to have worked, but why did the worker just get pinged 4 times within a co...

Chaika•6/5/24, 3:58 PM

because every new worker gets an ssl cert, and bots monitor ct logs/cert issuance

Mmicha It errored because it doesn't have a handler, and now I disabled the route, but ...

Chaika•6/5/24, 3:58 PM

that's a good idea if it's purely an email worker

Mmicha Also, at this point the certificate is out there, not really anything to do to c...

Isaac McFadyen•6/5/24, 4:35 PM

If you turn off workers.dev they can't hit the URL at all so it doesn't matter if the cert's out there.

Isaac McFadyen•6/5/24, 4:35 PM

If you're using the dashboard editor you can go into the Triggers tab on the configuration panel and disable it there.

Chaika•6/5/24, 4:37 PM

You can rename workers too under the Manage tab but yea a bit late now, good for future reference though

Mmicha (and the name of the .workers.dev zone itself is also something that's vaguely a...

Chaika•6/5/24, 4:38 PM

yea, right side of Workers & Pages overview

Chaika•6/5/24, 4:38 PM

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