Hello, I leave you the configuration that I made in both version 3.3.0-14 and 3.4.0-1 of sending emails, I hope it helps you solve the problem. It works for me in both versions
;;;;;;;;;;;;;;;;;;
; Email Settings ;
;;;;;;;;;;;;;;;;;;
[email]
---- INFORMATION IN VERSION 3.4.0-1 ----
; Default method to send emails
; Available options; sendmail, smtp, log, phpmailer
; default = sendmail
default = smtp
; Path to the sendmail, -bs argument is for using SMTP protocol
; sendmail_path = “/user/sbin/sendmail -bs”
sendmail_path = “/user/sbin/smtp -bs”
; Use SMTP for sending mail instead of mail()
smtp = On
; SMTP server settings
smtp_server = smtp.office365.com
smtp_port = 587
; Enable SMTP authentication
; Supported smtp_auth: ssl, tls (see PHPMailer SMTPSecure)
smtp_auth = starttls
smtp_username = username@dominio.xxx
smtp_password = password
---- INFORMATION IN VERSION 3.3.4.0-14 ----
; Supported smtp_authtype: RAM-MD5, LOGIN, PLAIN, XOAUTH2 (see PHPMailer AuthType)
; (Leave blank to try them in that order)
; Code for versions 3.3.0-14 and 3.4.0-1
smtp_authtype = Login
; The following are required for smtp_authtype = XOAUTH2 (e.g. GMail OAuth)
; (See Using Gmail with XOAUTH2 · PHPMailer/PHPMailer Wiki · GitHub)
; smtp_oauth_provider = Google
; smtp_oauth_email =
; smtp_oauth_clientid =
; smtp_oauth_clientsecret =
; smtp_oauth_refreshtoken =
; Enable suppressing verification of SMTP certificate in PHPMailer
; Note: this is not recommended per PHPMailer documentation
; smtp_suppress_cert_check = On
; Allow envelope sender to be specified
; (may not be possible with some server configurations)
allow_envelope_sender = On
; Default envelope sender to use if none is specified elsewhere
; default_envelope_sender = my_address@my_host.com
default_envelope_sender = username@dominio.xxx
; Force the default envelope sender (if present)
; This is useful if setting up a site-wide no-reply address
; The reply-to field will be set with the reply-to or from address.
force_default_envelope_sender = On
enable_attachments = On
; Force a DMARC compliant from header (RFC5322.From)
; If any of your users have email addresses in domains not under your control
; you may need to set this to be compliant with DMARC policies published by
; those 3rd party domains.
; Setting this will move the users address into the reply-to field and the
; from field wil be rewritten with the default_envelope_sender.
; To use this you must set force_default_enveloper_sender = On and
; default_envelope_sender must be set to a valid address in a domain you own.
force_dmarc_compliant_from = On
; The display name to use with a DMARC compliant from header
; By default the DMARC compliant from will have an empty name but this can
; be changed by adding a text here.
; You can use ‘%n’ to insert the users name from the original from header
; and ‘%s’ to insert the localized sitename.
; dmarc_compliant_from_displayname = ‘%n via %s’
; Amount of time required between attempts to send non-editorial emails
; in seconds. This can be used to help prevent email relaying via OJS.
time_between_emails = 3600
; Maximum number of recipients that can be included in a single email
; (either as To:, Cc:, or Bcc: addresses) for a non-privileged user
max_recipients = 10
; If enabled, email addresses must be validated before login is possible.
require_validation = Off
; Maximum number of days before an unvalidated account expires and is deleted
validation_timeout = 14