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1 vote
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Can the bulk execution of "dig domain mx" on 5000 domains be considered an attack to the network?

5000 queries is really not much, at least not when executed sequentially. For context, in DNS (server) sizing discussions, we'd usually talk about how many queries per second or maybe queries per ...
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1 vote

Can the bulk execution of "dig domain mx" on 5000 domains be considered an attack to the network?

The public resolvers operated by Google 8.8.8.8 and/or 8.8.4.4 (and IPv6) consider anything less than 1500 queries per second acceptable and not subject to rate limiting. Source: https://developers....
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0 votes

MX record pointing to different subdomains

The MX record tells email senders where to send email bound to a specific domain or subdomain. If you have that need, there's nothing preventing you from hosting the email for different domains with ...
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1 vote

Do I need to setup a mx record for an internal mail server in an isolated network

You need to set MX record(s) only in the following cases: have more than one mail server which manage mail for particular group of users have one mail servers and one or more mail forwarders have ...
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1 vote
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Do I need to setup a mx record for an internal mail server in an isolated network

No, you do not need an MX record. Mailservers can function without. But in general setting up an internal DNS server beats the alternative: maintaining hosts files and/or using IP-addresses everywhere....
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Will I receive emails sent while MX records are not synced with the DNS backend?

As gapsf points out, it varies. However, it depends where your MX records were pointing for all this time. If they were pointing at a server which wasn't expecting to be handling emails for your ...
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3 votes
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Will I receive emails sent while MX records are not synced with the DNS backend?

Default queue lifetime is configurable. So MTA owner may set it to what he wants. Typically 3-5 days. https://www.rfc-editor.org/rfc/rfc5321#section-4.5.4
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