@girish
The problem seems to be that on "Server A" I have to enable mailservices for the domain in question. Then when I try to send mail from Server B the

server B produces an error

{ "ts": 1663009665363, "type": "deferred", "direction": "outbound", "uuid": "B17FA8D4-5997-4FE6-8636-400140195457.1", "messageId": null, "mailFrom": "<>", "spamStatus": null, "rcptTo": [ "<no-reply@serverB.com>" ], "message": "Tried all MXs", "delay": 8192 }

and server A produces the error

{ "ts": 1663009909718, "type": "bounce", "direction": "outbound", "uuid": "380CB958-8DD9-45DC-B9C3-13F89C1FD866.1.1", "messageId": "<f993a729-8533-909f-f3d0-be386c19df96@draglabs.com>", "mailFrom": "<no-reply@draglabs.com>", "spamStatus": null, "rcptTo": [ "<user@serverB.com>" ], "message": "Some recipients failed: <user@serverB.com>", "mx": { "priority": 0, "exchange": "127.0.0.1", "port": 2424, "using_lmtp": true, "family": "A", "bind_helo": "my.draglabs.com" }, "bounced_rcpt": [ { "original": "<user@serverB.com>", "original_host": "serverB.com", "host": "serverB.com", "user": "user", "reason": "550 5.1.1 <user@serverB.com> User doesn't exist: user@serverB.com", "dsn_action": "failed", "dsn_smtp_code": "550", "dsn_smtp_extc": "5.1.1", "dsn_status": "5.1.1", "dsn_smtp_response": "<user@serverB.com> User doesn't exist: user@serverB.com", "dsn_remote_mta": "127.0.0.1" } ] }

What I think is happening is that because I enabled email on Server A, Server A is automatically looking for that user's email inbox to drop the email as opposed to routing it though the internet where is would use the MX records listed in the DNS.

So the question becomes how do you log into an email server without enabling inbound email.

Or how do you convince cloudron to be happy sending email from a different subdomain? like mail.serverb.com without setting the root of server be to my.mail.serverb.com

yes confirmed

I did some tests and they way it is configured now I can email anyone other than <user>@DomainB.com and if I disable "Incoming Email" then the server A user "relay@serverB.com" cannot authenticate for the purpose of sending emails.

@subven @girish - Any Ideas on a solution here?

@girish Mailgun. It hasn't happened again (so far). BTW, the notification error listed only two out of ten domains (all using Mailgun).

@TechoutDev To debug, open the mail logs window. Mail -> Logs button in top right. And then there is another logs button inside it. Keep that browser window open. Then, use the send test mail button - https://docs.cloudron.io/email/#send-test-email . Can you please post what's in the logs?

@hollosch 👍 👏 🍾

We didn't get to the bottom of this but the user solved it by moving to sendgrid.

@girish Wow that worked perfectly, thank you so much! 😊

@nebulon Thanks for helping me work through this!

This got sorted out by @ntnsndr by contacting linode support. The VM had to be rebooted after linode unblocked port 25.

I updated the email relay page with newer screenshots of the SES console - https://docs.cloudron.io/email/#amazon-ses

@d19dotca thank you, I appreciate your quick response and correcting on the wrong topic!

I did the search indeed, but I guess it was a wrong search query 😃

@subtlecourage said in Outbound SMTP not working on my External Relay:

It says it should be coming from noreplay@domain.com, but instead it is coming from imanalias@domain.com

Can you clarify what you mean by "it says"? Is there some error/warning somewhere? Also, I assume that you have put a custom domain in fastmail and also fastmail is able to relay mail as any email address i.e <anything>@domain.com ?

@girish said in Email into apps - DNS/MX/CNAME/TXT:

You have to setup the CNAME/TXT for the root domain and not for my.example.com. You don't have to set it up for each app individually

Thank you. That was my main issue.

Nevermind, I did not realize sendgrid setup was only for sending email, I see the other parts to setup for receiving email now. Please disregard.

@dantheman https://mxtoolbox.com/emailhealth is another good one.

The root cause for this was the Cloudron server had the hostname as "box.domain.com" (same as the relay). Debian/Ubuntu has a quirk that it will put the hostname in /etc/hosts to resolve as 127.0.1.1. This meant that when we try to set it as relay, it resolves to 127.0.1.1 instead of the actual IP.

To add to the confusion, I suggested using the host command which does not use /etc/hosts (i.e the nsswitch mechanisms) and uses only the DNS. If I had suggested using ping then we would have narrowed down the issue more quickly...

Anyway, the fix is simply to hostnamectl set-hostname somethingelse.domain.com and also edit /etc/hosts (for some reason, hostnamectl doesn't change hosts file even after reboot, 🤷 ).

@drpaneas said in gmail blocks my server?:

@jdaviescoates I have cloudron installed at home.

Ah, right.

@girish Awesome thanks.

@msbt thanks! I will try to see if I can make this just "work" in the next release.

@girish I originally tried that with no success, I figured that the Ghost CLI command initiated some other process or method

@marcusquinn I think DNS automation (provider specific) atleast needs to come from elasticemail itself ideally. It's not possible to keep track of all the DNS records each provider wants to set and if it's even available with API. It's basically impossible to test on our side atleast.

I've tried sendgrid and mailgun. 1. They were both similiar in ease to configure. 2. Mailgun seems like a better deal for those not using a massive amount of emails a month.

@edapm Personally, I'm all-in with Hetzner, not free but the best value for features I've found, particularly having network DDoS protection as standard. Others recommended include Contabo and Scaleway.

If you're getting free (inclusive) stuff from Microsoft then I suppose that's decent. Personally, I'm all GitLab, so anything GitHub is second-choice.

I guess there's nothing truly free, including your time, but those are the options I recommend, otherwise it's support tickets to Azure and hope for their ability to allow for port needs.

@girish said in Email not sending:

include:sendgrid.net

Thanks!

@rfg You have to setup a mail relay for your outbound mails. The big cloud providers like aws, gce, azure will all block emails from VMs directly. See https://cloudron.io/documentation/email/#relay-outbound-mails

@hendrikvl said in sender rewriting when using external SMTP:

And no, my mail relay does not accept IP whitelisting. It's not a proper mail relay service to be exact, but just a regular mail service with outgoing smtp for authenticated users.

Ah yes, someone was trying to do this with a gmail account as well sometime back (and more recently with a mailbox.org account). I think we have to implement this feature in Cloudron to make this use case work.

Hi @girish ,
I see, it seems to be that indeed. The server runs on Upcloud actually.
I will try one of the solution you propose.

Many thanks for your help,
d