@Nico If I understand correctly, you have configured mailgun as a relay on Cloudron - https://docs.cloudron.io/email/#relay-outbound-mails . Is that correct? What port have you configured for the relay? You must use port 587 (STARTTLS).
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smtp server configuration
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Smtp Connection timeout
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Send email with brevo relay
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Outbound SMTP issue
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smtp issues
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External SMTP
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External SMTP server
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Sogo calendar don't send invites
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