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I can't send e-mails from my app

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Patrycja Mackiel
Patrycja Mackiel
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Hello, I have been using Thunderbird on my computer and mobile for a long time. Suddenly, my mobile app stopped sending e-mails. I can receive emails but can't send them. All settings are same as usual, all ports seems correct. Below I am pasting the message I get after trying to send email. Just so you know, from my hosting provider (hostinger) it all works well. It works with any other app than Thunderbird. What could be the solution? I really need it ASAP. :C


This is the mail system at host uk-fast-smtpout1.hostinger.io.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

<here is the recipient email>: host smtp.mailchannels.net[54.203.146.40] said: 

   550 5.7.1 [CS] Message blocked. If this is a false positive, please report
   this to your hosting service provider. See
   https://console.mailchannels.net/insights/bounce?auid=hostingeremail&sender=b2b%40lucky-jobs.pl&txid=4dacfff70fcf558b
   (in reply to end of DATA command)
Hello, I have been using Thunderbird on my computer and mobile for a long time. Suddenly, my mobile app stopped sending e-mails. I can receive emails but can't send them. All settings are same as usual, all ports seems correct. Below I am pasting the message I get after trying to send email. Just so you know, from my hosting provider (hostinger) it all works well. It works with any other app than Thunderbird. What could be the solution? I really need it ASAP. :C This is the mail system at host uk-fast-smtpout1.hostinger.io. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. <here is the recipient email>: host smtp.mailchannels.net[54.203.146.40] said: 550 5.7.1 [CS] Message blocked. If this is a false positive, please report this to your hosting service provider. See https://console.mailchannels.net/insights/bounce?auid=hostingeremail&sender=b2b%40lucky-jobs.pl&txid=4dacfff70fcf558b (in reply to end of DATA command)

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