SASL authentication no mechanism available

When sending email from postfix mail sever that use mailgun for relaying mails, i get error Jan 4 03:16:06 serverok-vm postfix/qmgr[22652]: 795731A8D: from=, size=820, nrcpt=1 (queue active) Jan 4 03:16:06 serverok-vm postfix/smtp[24050]: warning: SASL authentication failure: No worthy mechs found Jan 4 03:16:06 serverok-vm postfix/smtp[24050]: 795731A8D: SASL authentication failed; cannot authenticate to server smtp.mailgun.org[34.237.7.101]: no […]

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