(free) postmaster tools

postmaster tools

Topics in this area:

enigma secure email

share your secrets via email - enigma is a secure, one-time use, passwordless link generator

inxbox temporary email

a ready-to-use mailbox that receives any message and keeps it for a limited time

inxsend fake smtp/api service

a fake smtp/api service with web gui for testing emails in applications easily

tester for spf and dkim

an online check tool to validate SPF and DKIM settings sending an email message

Subsections of (free) postmaster tools

enigma secure email

secure email secrets

Email is not private or secure. It wasn’t designed with privacy or security in mind.
Anyone who handles your email in transit can read it,
including your ISP, a hacker, or the NSA (U.S. National Security Agency).

End-to-end (e2ee) encryption for email can be used to ensure
that only the sender and the recipient of a message can read the contents.
PGP is the best solution for secure communications with a partner that is
already using it. Asking your counterpart to start using PGP could be hard.

Enigma is an app based on the SnapPass open source project.
It allows you to share secrets in a secure, ephemeral way.
Input a single or multi-line secret, its expiration time and click Generate URL.
Share the one-time use URL with your intended recipient.

Try it out:
enigma.realsender.com



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inxbox temporary email

inxbox temporary email

inxbox is a ready-to-use temporary mailbox
that receives any message  
and keeps it in memory for an hour

!! all received messages are visible to anyone !!
Try it yourself now! (1)
  • send a message to: [yourname]@inxbox.realsender.com
  • open https://inxbox.realsender.com/monitor and check check for reception
    (use Google Chrome browser > New Incognito Window or Microsoft Edge browser)
Try it yourself now! (2) with your own domain
  • change/add the MX record of your domain to:
    MX “10 inxbox1.realsender.com”
  • Send a message to: yourname@yourdomain
  • open https://inxbox1.realsender.com/monitor and check check for reception
    (use Google Chrome browser > New Incognito Window or Microsoft Edge browser)

pay attention: the associated domain name is different from the previous point

Download the messages via pop3
  • configure your email client with the following settings
  • Server Type: POP Mail Server
  • Server Name (1): inxbox.realsender.com - Port: 110 (Default)
  • Server Name (2): inxbox1.realsender.com - Port: 110 (Default)
  • User Name: only “yourname” within the recipient address
  • Password: any value is accepted


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inxsend fake smtp/api service

inxsend fake smtp/api service

inxsend is a Fake SMTP/API Service

for testing emails in applications easily
by sending all the messages to a single mail server
SMTP server settings

Configure the smtp server with the following parameters:

Server Name: inxsend.realsender.com  
Port:        25 |or| 2525 |or| 587 (+TLS) |or| 465 (+SSL)  
User Name:   CDED54  
Password:    478DED
API server settings

Use API access as described in the “sending via api” instructions, with the following parameters:

Server address: (https://) inxsend-api.realsender.com/mail/send
apiuser:        CDED54  
apipass:        478DED
Send a test message

Send a message to:
[yourname]@inxbox.realsender.com

!! all received messages are visible to anyone !!
(other recipients will be rejected)

Let us know if you’re facing any issue.

Check reception

Open https://inxbox.realsender.com/monitor and check for reception
(use Google Chrome browser > New Incognito Window or Microsoft Edge browser)

Further information on this mailbox is available at: inxbox temporary email.



RealSender offers a dedicated smtp/api service, if you want to give it a try:

Request RealSender free trial

tester for spf and dkim

spf + dkim tester

RealSender offers a free online check tool
to validate your SPF + DKIM settings sending an email message:

  1. send an email to spf@tester.realsender.com
  2. check online the SPF validation results at tester.realsender.com/spf
    (it will take a minute to appear)

During verification, a prefix is added to the subject
if the message is not authenticated correctly.

Details on how it works
are located in the “email authentication basics” area of the website:
email authentication basics :: <spf> check online



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