[share receive-email] functionality not delivering emails (https://exe.dev/docs/receive-email)

[jeroendee]

Want

Emails being delivered to ~/Maildir/new when the feature, through subcommand share receive-email {vmname} on, is activated as per the instructions in: https://exe.dev/docs/receive-email

Or

Note

Am I misinterpreting how this functionality should work.

Got

Given I've actually followed the instructions in the manual: https://exe.dev/docs/receive-email

When I tried several times to send emails to that vm (with multiple email providers).
Then the emails bounce. Example below is from the fastmail service:

There are 3 *.eml files available but these are all from the exe.dev system itself. Apparently example emails are being delivered when share receive-email on is being executed.

Supporting info:

"My" VM's are now located in Region: fra (Frankfurt, Germany) Originally they were humming somewhere in the US. I put in a support request for them to be migrated to Frankfurt.

[ianlancetaylor]

I just tested the functionality, and it is working.

Perhaps there is some DNS issue here. Can you show the output of dig VMNAME.exe.xyz mx?

[jeroendee]

@ianlancetaylor thank you for looking into this issue I'm having.

When running the command from my computer: dig vector-sigma.exe.xyz mx (assuming VMNAME is my chosen machine name) this is the output:

; <<>> DiG 9.10.6 <<>> vector-sigma.exe.xyz mx
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16811
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;vector-sigma.exe.xyz.          IN      MX

;; ANSWER SECTION:
vector-sigma.exe.xyz.   300     IN      MX      10 mail.exe.xyz.

;; Query time: 170 msec
;; SERVER: 100.100.100.100#53(100.100.100.100)
;; WHEN: Thu Apr 16 07:34:20 CEST 2026
;; MSG SIZE  rcvd: 70

I asked Pi (GPT-5.4 xhigh) to interpret the above, and it proposed to do further analysis. I've asked it to write it up in a markdown file. I don't want to confront you with a wall of text in this issue. So I'll attach it as a file. Maybe it contains some helpful information for you.

I've also fed it the Fastmail bounce messages.

vector-sigma-exe-xyz-mail-report.md

“Authoritative DNS for vector-sigma.exe.xyz currently returns both MX 10 mail.exe.xyz and CNAME na013.exe.xyz. Fastmail’s DSN shows it is attempting SMTP delivery directly to vector-sigma.exe.xyz
[161.210.92.13]:25 instead of the MX host. This strongly suggests the invalid CNAME + MX publication is causing some MTAs to bypass or mishandle the MX. Could you remove the CNAME from the mail-receiving name,
or publish direct A/AAAA for the VM name instead?”

[jeroendee]

I've tried another VM as well, and the same situation exists. No mail being delivered.