I’m using an email-triggered workflow on Pipedream via the @upload.pipedream.net address.
Most of the time it works fine, but sometimes when I send an email to it, the message bounces back with this error.
This is the full bounce message (only my address is redacted):
This is the mail system at Centrum Holdings
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 contact your system administrator.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
Final-Recipient: rfc822; mytriggeraddress@upload.pipedream.ne t
Original-Recipient: rfc822;mytriggeraddress@upload.pipedream.ne t
Action: failed
Status: 5.7.1
Remote-MTA: dns; inbound-smtp.us-east-1.amazonaws.c om
Diagnostic-Code: smtp; 550 5.7.1 IP address blacklisted by recipient
From what I understand, the Pipedream email endpoint is fronted by AWS’s inbound SMTP service (inbound-smtp.us-east-1.amazonaws.com), and that service is rejecting my mail because the sending IP (Centrum’s outgoing mail server) is on some blacklist.
My questions:
Is there anything I can do on the Pipedream side to avoid these bounces (e.g. alternative email endpoint/region, some kind of allow‑list, etc.)?
Is this entirely on my email provider (Centrum / pobox.sk) and I just have to ask them to fix their blacklisted IPs or switch to another email provider?
Is it expected that AWS/Pipedream may sometimes refuse emails from certain providers because of IP reputation, and there’s no workaround except using a “clean” sending service?
I mainly want to confirm that this is expected behavior (AWS/Pipedream rejecting blacklisted IPs) and that there’s no configuration in my Pipedream workflow I’m missing.
Thanks in advance for any hints or best practices on reliably using the email trigger without running into IP‑blacklist issues.
Thank you for the detailed explanation and error message. Here’s a step-by-step response to your questions, based on how Pipedream’s email triggers work and the infrastructure involved:
1. Is there anything I can do on the Pipedream side to avoid these bounces (e.g. alternative email endpoint/region, some kind of allow‑list, etc.)?
Short answer:
There is no configuration or allow-list on the Pipedream side that you can change to bypass AWS’s inbound SMTP filtering or to select a different region for the @upload.pipedream.net email endpoint. The email trigger is fronted by AWS SES (Simple Email Service) inbound SMTP, and AWS controls the anti-spam and IP reputation filtering. Pipedream does not expose settings to override or bypass these filters.
No allow-list or bypass: You cannot add your sender to a safe list or bypass AWS’s filtering.
No region selection: The @upload.pipedream.net address is tied to a specific AWS region (typically us-east-1) and cannot be changed by the user.
No alternative endpoint: All large email endpoints use the same AWS SES infrastructure.
2. Is this entirely on my email provider (Centrum / pobox.sk) and I just have to ask them to fix their blacklisted IPs or switch to another email provider?
Yes, this is an issue with your email provider’s outgoing IP reputation.
The bounce message (550 5.7.1 IP address blacklisted by recipient) means AWS SES has rejected the message because the sending IP is on a blacklist. This is a common anti-spam measure.
What you can do:
Contact your provider (Centrum / pobox.sk) and ask them to resolve their IP reputation issues.
Alternatively, send emails from a different provider with a better reputation (e.g., Gmail, Outlook, or a transactional email service like SendGrid, Mailgun, etc.).
3. Is it expected that AWS/Pipedream may sometimes refuse emails from certain providers because of IP reputation, and there’s no workaround except using a “clean” sending service?
Yes, this is expected behavior.
AWS SES will reject emails from IPs that are on known blacklists to protect their infrastructure and users from spam and abuse. Pipedream cannot override these AWS-level decisions.
No workaround on Pipedream: The only way to ensure reliable delivery is to send from a provider with a good reputation and clean IPs.
Summary / Best Practices
This is expected behavior: AWS SES (and therefore Pipedream) will reject emails from blacklisted IPs.
No Pipedream-side fix: There’s no configuration or workaround on Pipedream to bypass this.
Use a reputable sender: For reliable delivery, use an email provider with good IP reputation.
If you need to receive from a specific provider: Work with that provider to resolve their blacklist status.
If you have further questions or need help troubleshooting, you can always reach out to Pipedream.
References:
Pipedream Email Trigger Docs
AWS SES Inbound SMTP Filtering (external, for context)
Let me know if you need more details or have follow-up questions!
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