Error when i try to send 30 mail in 1sec, all crash

[Cedric921]

Error: Data command failed: 421 4.3.0 Temporary System Problem. Try again later (10). b15-20020a5d4b8f000000b0021b98d73a4esm4733091wrt.114 - gsmtp
at SMTPConnection._formatError (/home/cedric/GDA/projects/attendancy-gda/node_modules/nodemailer/lib/smtp-connection/index.js:784:19)
at SMTPConnection._actionDATA (/home/cedric/GDA/projects/attendancy-gda/node_modules/nodemailer/lib/smtp-connection/index.js:1650:34)
at SMTPConnection. (/home/cedric/GDA/projects/attendancy-gda/node_modules/nodemailer/lib/smtp-connection/index.js:1622:26)
at SMTPConnection._processResponse (/home/cedric/GDA/projects/attendancy-gda/node_modules/nodemailer/lib/smtp-connection/index.js:947:20)
at SMTPConnection._onData (/home/cedric/GDA/projects/attendancy-gda/node_modules/nodemailer/lib/smtp-connection/index.js:749:14)
at TLSSocket.SMTPConnection._onSocketData (/home/cedric/GDA/projects/attendancy-gda/node_modules/nodemailer/lib/smtp-connection/index.js:189:44)
at TLSSocket.emit (node:events:527:28)
at addChunk (node:internal/streams/readable:315:12)
at readableAddChunk (node:internal/streams/readable:289:9)
at TLSSocket.Readable.push (node:internal/streams/readable:228:10) {
code: 'EENVELOPE',
response: '421 4.3.0 Temporary System Problem. Try again later (10). b15-20020a5d4b8f000000b0021b98d73a4esm4733091wrt.114 - gsmtp',
responseCode: 421,
command: 'DATA'
}