Block Senders who have Numbers in their Email Adress

[Holy]

Hello,

a customer asked me if it is possible to block / deny senders which have numbers in their email adresses like (mike445@example.com) .

is it possible to build like a regex for that? is it possible to say if Sender has more than 2 Numbers or more than 3 numbers in his email adress?

Thank you very much

[emnoc]

Never heard of that, but it's NOT uncommon to have numbers in a email-address and specifically from a internet free email provider like gmail. Heck you will block a lot of emails if you actually did  this ;)

I wonder if you have a incoming policy with a LDAP  control to do this  tho. This might be doable let's in a organization and  address verifications for OUTBOUND but for incoming that would be strange approach? But typically  ldap is done for recipient verification and to set specific receipient  AS/AV profiles and controls from experience.

[Bromont_FTNT · Accepted solution]

I haven't fully tested but you could try matching the sender with this regex in DLP incoming: .*[0-9][0-9]

[Holy]

Bromont wrote:

I haven't fully tested but you could try matching the sender with this regex in DLP incoming: .*[0-9][0-9]

Thank you i will try

[Holy]

Bromont wrote:

I haven't fully tested but you could try matching the sender with this regex in DLP incoming: .*[0-9][0-9]

Thank you very much! it does work :)

[Holy]

Hello,

now we have the Problem that Emails that will be signed for BATV like prvs=0091694b28=sn@example.com will be blocked because of that Regex :)

how should the Regex look like if it should match only this Criteria.

All Letters .(dot) numbers @ domain  for example xyz.778@example.com

is it possible ?

Thank you

[Holy]

i tried like 

/^[a-zA-Z]$/\..*[0-9][0-9]

but no success... 

[rwpatterson]

Holy wrote:

Bromont wrote:

I haven't fully tested but you could try matching the sender with this regex in DLP incoming: .*[0-9][0-9]

Thank you very much! it does work :)

try .*[0-9][0-9]\@ - That translates to "Anything (.) any amount of times (*) followed by two numbers ([0-9][0-9]) then the @ sign"

[Holy]

rwpatterson wrote:

Holy wrote:

Bromont wrote:

I haven't fully tested but you could try matching the sender with this regex in DLP incoming: .*[0-9][0-9]

Thank you very much! it does work :)

try .*[0-9][0-9]\@ - That translates to "Anything (.) any amount of times (*) followed by two numbers ([0-9][0-9]) then the @ sign"

Hello,

thank you but in this will again block BATV signed emails like (email=prvs=0091694b28=sn@example.com) because.

i need a Regex who says.

Anything then (.) and then any Numbers. for Email senders lie   Abc.3344@example.net

what would be the Regex for that?

[Holy]

Hello,

if anyone need this Regex my mate helped me :)

here it is:  ^[a-z]+[a-z]*[.]+[0-9]*@[0-9a-z]+[-\._^0-9a-z]*[0-9a-z]+[\.]{1}[a-z]{2,6}