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Check If Email Exists

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Re: Check If Email Exists

#131

Post by killingtime74 »

profmonocle wrote: post #105
Cyberdog wrote: post #8

Could someone spell out a use case for this? One that comes to mind would be validating that a mailing list doesn't have any outdated email addresses in it, but couldn't that be determined by just checking for a bounce when a message is sent to it? I tried to sign up for SiriusXM the other day, and though I could create an account with my .pro email address, I couldn't actually sign up for service with that same addr…

A non-marketing example: We were onboarding a large new client to our SAAS product. This process involved creating accounts for all of their employees (tens of thousands) and sending emails with an activation link. (Where they'd be able to set up their password.) Our system sends these emails in batches, and as soon as the first batch went out we got an alert from our monitoring system that our bounce rate was surgin…

I’ve never worked with emails, could you not send these first emails yourself and not use SES

Re: Check If Email Exists

#132

Post by X-Cubed »

spondyl wrote: post #62
adamparsons wrote: post #44

Earlier quoted context omitted.

{ "input": "***redacted***", "is_reachable": "unknown", "misc": { "is_disposable": false, "is_role_account": false }, "mx": { "accepts_mail": true, "records": [ "in2-smtp.messagingengine.com.", "in1-smtp.messagingengine.com." ] }, "smtp": { "error": { "type": "TimeoutError", "message": "future has timed out" } }, "syntax": { "address": "***redacted***", "domain": "***redacted***", "is_valid_syntax": true, "username":…

I have my email with Fastmail too and issuing a RCPT TO command via telnet returns the following: > 451 4.7.1 : Recipient address rejected: Temporary deferral, try again soon

The library identifies itself to the mail server with a from address of "testing@example.com".

It's probably a good idea to use an email address you own as the from address if you want to use this in production, eg: "testing@mycorp.com", to avoid this grey-listing.

Re: Check If Email Exists

#133

Post by nemosaltat »

wyager wrote: post #91
tlogan wrote: post #86

Earlier quoted context omitted.

Not really: but majority of spammers think that they are doing marketing.

I've never once received a "marketing email" that wasn't spam.

I have! Expensify. Not a customer, and never have been. Signed up because I was considering using the service. The emails are exceedingly infrequent and delightful to read.

Re: Check If Email Exists

#134

Post by polynomial »

kapp_in_life wrote: post #109
profmonocle wrote: post #105

Earlier quoted context omitted.

A non-marketing example: We were onboarding a large new client to our SAAS product. This process involved creating accounts for all of their employees (tens of thousands) and sending emails with an activation link. (Where they'd be able to set up their password.) Our system sends these emails in batches, and as soon as the first batch went out we got an alert from our monitoring system that our bounce rate was surgin…

I'd hope you'd at least be able to explain the situation to your account manager and get an exception(maybe for that single companies domain?), but I've never used AWS so I wouldn't know if thats possible.

account manager? you fancy.

Re: Check If Email Exists

#136

Post by mdasen »

On your site (https://reacher.email) it shows "Open-Source" next to the MIT logo. To any reasonable person, that means "it's licensed under the MIT license". Instead, it's licensed under the AGPL. It would be good if you changed it to remove the implication that it was MIT licensed.

Re: Check If Email Exists

#137

Post by vatican_banker »

Cyberdog wrote: post #8

Could someone spell out a use case for this? One that comes to mind would be validating that a mailing list doesn't have any outdated email addresses in it, but couldn't that be determined by just checking for a bounce when a message is sent to it? I tried to sign up for SiriusXM the other day, and though I could create an account with my .pro email address, I couldn't actually sign up for service with that same addr…

Financial/fintech companies use services like these for fraud-detection on account opening. While validating an email is by no means and exhaustive and conclusive signal to classify a fraud/genuine user, verifying the validity of new customers's email addresses is a big help.

Re: Check If Email Exists

#138

Post by saagarjha »

mdasen wrote: post #136

On your site ( https://reacher.email ) it shows "Open-Source" next to the MIT logo. To any reasonable person, that means "it's licensed under the MIT license". Instead, it's licensed under the AGPL. It would be good if you changed it to remove the implication that it was MIT licensed.

Uh, what? "Open source" doesn't mean "MIT" any more than "vehicle" means "truck"…

Re: Check If Email Exists

#139

Post by mattowen_uk »

spondyl wrote: post #65
Cyberdog wrote: post #8

Could someone spell out a use case for this? One that comes to mind would be validating that a mailing list doesn't have any outdated email addresses in it, but couldn't that be determined by just checking for a bounce when a message is sent to it? I tried to sign up for SiriusXM the other day, and though I could create an account with my .pro email address, I couldn't actually sign up for service with that same addr…

Personally, I do this kind of thing manually if I want to send some positive feedback to people who work at companies I like, but they don't have any obvious emails published. A recent example was the CEO of Evernote for the work put in to their behind the scenes series although I don't expect anyone to read it of course. People are busy! I wrote a bit about it here: https://utf9k.net/blog/email-lookup/ Now does this…

The non-interactive nslookup for Windows invocation:

  nslookup -query=mx evernote.com
Edit: Trying out the macOS/Linux invocation on Windows also works:

  nslookup -q=mx evernote.com
Oddly, the first time I did this, I only got IPv4 results, subsequent queries for the same domain, included IPv6 as well.
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