Axios error trying to verify email setup

[rongage]

The Basics

• Nextcloud Server version (e.g., 29.x.x):
  • 31.0.7
• Operating system and version (e.g., Ubuntu 24.04):
  • Centos Stream 9
• Web server and version (e.g, Apache 2.4.25):
  • Apache 2.4.62
• Reverse proxy and version _(e.g. nginx 1.27.2)
  • not in play - yet
• PHP version (e.g, 8.3):
  • 8.3.19
• Is this the first time you’ve seen this error? (Yes / No):
  • Yes
• When did this problem seem to first start?
  • On initial configuration
• Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
  • Unzip archive downloaded from Nextcloud
• Are you using CloudfIare, mod_security, or similar? (Yes / No)
  • Yes - Mailgun for SMTP

Summary of the issue you are facing:

[…]

Configuration

Nextcloud

The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):

[root@web01 config]# cat config.php
<?php
$CONFIG = array (
  'instanceid' => '<snip>',
  'passwordsalt' => '<snip>',
  'secret' => '<snip>',
  'trusted_domains' =>
  array (
    0 => 'URL#0',
    1 => 'URL#1',
  ),
  'datadirectory' => '/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '31.0.7.1',
  'overwrite.cli.url' => 'my URL',
  'dbname' => 'nextcloud',
  'dbhost' => 'db1',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '<snip>',
  'installed' => true,
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'localhost',
    'port' => '6379',
    'timeout' => 0.0,
  ),
  'maintenance' => false,
  'mail_from_address' => 'nextcloud',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => '<snip>',
  'mail_smtphost' => 'smtp.mailgun.org',
  'mail_smtpport' => '587',
  'maintenance_window_start' => 3,
  'default_phone_region' => 'US',
  'loglevel' => 2,
  'mail_smtpauth' => true,
  'mail_smtpname' => 'The actual account email on mailgun',
  'mail_smtppassword' => '<snip>',
);

Apps

None yet - still working on config issues

[jtr]

From what I can tell your mail config looks reasonable for usage with Mailgun.

Does the Nextcloud account your testing from (i.e. your administrator account) have an email address configured yet?

[jhonnmarie]

The Axios email verification error is likely due to CORS or misconfigured SMTP settings. Since you’re using Mailgun with SMTP, double-check that ‘mail_smtpname’ exactly matches your Mailgun SMTP login (usually postmaster@yourdomain.com), ensure port 587 is open and not blocked by a firewall, and that SELinux (if enabled) isn’t interfering. Also, confirm that Mailgun allows sending from the domain set in ‘mail_domain’. Finally, check your browser’s developer console for CORS errors—adding your domain to the trusted_domains and setting ‘overwrite.cli.url’ correctly should help resolve it. ⩇⩇:⩇⩇