When to use it

• You want to send the same message to a list of contacts from your email client (Outlook, Gmail, Thunderbird…) without importing the list into Mailrelay or creating a campaign.
• You have a system that generates recipient lists as CSV and need a simple way to send to them.
• You want to track opens, clicks and deliveries for that send in the Mailrelay interface.

Step by step

1. Open the SMTP settings

   In the side menu, go to Settings → SMTP settings. In the right-hand column, under SMTP configuration, you’ll see the Recipients.csv relay block.

2. Check that the relay is on

   The block’s switch must be on . When it is on, the relay address is shown and a link to disable the relay appears.

3. Copy the relay address

   Click the copy button next to Relay address. For this account it is:

   Relay address relay@relay.ipzmarketing.com Copy

4. Prepare the recipients.csv file

   Create a CSV file with one email address per line. Save it as UTF‑8 and name it exactly recipients.csv.

   recipients.csv

   email
   anna.smith@example.com
   john.miller@example.com
   laura.jones@example.com

   You can export it from Excel or Google Sheets with Save as → CSV. Make sure there are no empty rows, extra spaces or duplicate addresses.

5. Write the message and attach the CSV

   Write the email exactly as you want your contacts to receive it: subject, body, images and attachments. Put the relay address as the recipient and attach recipients.csv.

   Fromnewsletter@yourdomain.com

   Torelay@relay.ipzmarketing.com

   SubjectOctober news

   Attachmentrecipients.csv

   Hi, this month we’re sharing…

6. Send the message

   Mailrelay receives the email at the relay address, reads the CSV and delivers the message to every contact in the file. You send one email; the server handles the distribution.

7. Check the reports

   Review the results of the send in Mailrelay’s tracking reports. To record opens and clicks, also turn on SMTP tracking on this same page.

Other options in the same panel

Tips and common issues

• Nobody receives it: check that the attachment is named exactly recipients.csv and that the relay is enabled.
• Some contacts are missing: look for misspelled addresses, cells with spaces, or a different separator (semicolon instead of comma).
• Test first: send with a CSV that only contains your own addresses before sending to the real list.
• Deliverability: send from a domain authenticated in Settings → Email authentication so the message doesn’t end up in spam.
• Consent: only include contacts who have agreed to receive your emails.

Account notice: transactional sending through SMTP is now a paid add-on.