Validating email in spring boot - spring

How to check if email exists before sending verification mail in spring boot ?
Right now, i am just checking email using regex and after sending, i am getting sending failed to my mail as to email is invalid

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laravel sengrid random authentication failure when sending emails with attachment

We are able to send out emails but a problem seems to occur when the email has an attachment.
we're getting this authentication error which is weird because we are able to send out no attachment emails so I'm not sure why it suddenly fails to authenticate.
Symfony\Component\Mailer\Exception\TransportException: Failed to
authenticate on SMTP server with username "myemail#email.com" using
the following authenticators: "LOGIN", "XOAUTH2". Authenticator
"LOGIN" returned "Expected response code "235" but got code "535",
with message "535 5.7.139 Authentication unsuccessful, the user
credentials were incorrect. [xxx.xxx.PROD.OUTLOOK.COM]".".
Authenticator "XOAUTH2" returned "Expected response code "235" but got
code "535", with message "535 5.7.3 Authentication unsuccessful
[xxx.xxx.PROD.OUTLOOK.COM]".". in
/var/www/project/vendor/symfony/mailer/Transport/Smtp/EsmtpTransport.php:198
Is this something related to our SendGrid configuration that we've missed? or could this be a server-related problem since our test server is able to send out emails with attachments fine? just this one live server is having the issue
Our test server is also using the same SendGrid account with a different API key and is able to send out emails with attachments okay.
We are using ubuntu and nginx

Why does laravel need authentication while sending mails?

Why does laravel need authentication while sending mails? Is it possible to send mail without authentication just a valid email id?

Why I When I using mailgun for sending from yahoo mail or sending to yahoo mail it not works?

when i using gmail email it can be reset and set the from recipents
but when using yahoo mail the set from doent send and reset to yahoo address was error with
Expected response code 250 but got code "554", with message "554 Sandbox subdomains are for test purposes only. Please add your own domain or add the address to authorized recipients in Account Settings. "
Did you check out this page?
If this is the cause you could try sending an text-only e-mail for testing purposes, see if that does works.

How to catch mailgun errors in laravel

I have mailgun set up and working just fine. The problem occurs when I try to send an email to an email which doesn't exists. Use can put any email so if the email is correct mailgun sends it perfectly. But if it is incorrect it generates an error in laravel applications
Swift_TransportException (554)
Expected response code 250 but got code "554", with message "554 Free
accounts are for test purposes only. Please upgrade or add the address to
authorized recipients in Account Settings.
How can I catcth this exception in laravel without generating errors?

Magento api Your authorization request is invalid

I'm trying to connect with Magento 1.X Rest Api, but when I try to do a get request on:
http://magentohsot.com.br/admin/oauth_authorize?oauth_token=XXXXXX
I get the error: An error occurred. Your authorization request is invalid.
I already checked the oauth consumer key and oauth consumer secret and they are right.
To generate the oauth_token I did a get request in Postman with this:
http://magentohost/oauth/initiate?oauth_consumer_key=xxxx&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1475102900&oauth_nonce=5wq5DG&oauth_version=1.0&oauth_signature=nWhmHcih/DvtXuDOjjvJJVnWrss=&oauth_callback=xxxx
How can I fix this?

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