使用默认发件人和收件人地址发送带有crontab的邮件

当我运行sendmail时，crontab会在mail.log中的日志下面显示

2020-07-17T02:50:12.431886-07:00 localhost postfix/qmgr[1371]: 681EC1FFEF: from=<nramasurbramanian@localhost>, size=777, nrcpt=1 (queue active)
2020-07-17T02:50:12.435570-07:00 localhost postfix/local[26936]: 681EC1FFEF: to=<nramasurbramanian@localhost>, orig_to=<nramasurbramanian>, relay=local, delay=0.03, delays=0.02/0/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
2020-07-17T02:50:12.435720-07:00 localhost postfix/qmgr[1371]: 681EC1FFEF: removed

2020-07-17T02:50:12.431886-07:00本地主机后缀/qmgr[1371]：681EC1FFEF:from=，size=777，nrcpt=1（队列活动）
2020-07-17T02:50:12.435570-07:00本地主机后缀/本地[26936]：681EC1FFEF:to=，orig_to=，relay=local，delay=0.03，delays=0.02/0/0，dsn=2.0.0，status=sent（发送到邮箱）
2020-07-17T02:50:12.435720-07:00本地主机后缀/qmgr[1371]：681EC1FFEF:已删除

和我在命令行中正常运行时一样，它工作正常，如下所示

2020-07-17T02:51:17.838476-07:00 localhost postfix/qmgr[1371]: CC8291FFEF: from=<support@test.com>, size=2239, nrcpt=1 (queue active)
2020-07-17T02:51:19.016735-07:00 localhost postfix/smtp[27130]: CC8291FFEF: to=<in.support@test.com>, relay=aspmx.l.google.com[108.177.127.27]:25, delay=1.2, delays=0/0.02/0.76/0.4, dsn=2.0.0, status=sent (250 2.0.0 OK  1594979478 x17si5640395edq.338 - gsmtp)
2020-07-17T02:51:19.016905-07:00 localhost postfix/qmgr[1371]: CC8291FFEF: removed

2020-07-17T02:51:17.838476-07:00本地主机后缀/qmgr[1371]：CC8291FFEF:from=，size=2239，nrcpt=1（队列活动）
2020-07-17T02:51:19.016735-07:00本地主机后缀/smtp[27130]：CC8291FFEF:to=，relay=aspmx.l.google.com[108.177.127.27]：25，延迟=1.2，延迟=0/0.02/0.76/0.4，dsn=2.0.0，状态=sent（250 2.0.0.0正常1594979478 x17si5640395edq.338-gsmtp）
2020-07-17T02:51:19.016905-07:00本地主机后缀/qmgr[1371]：CC8291FFEF:已删除

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从crontab运行时是否有默认配置？

在提供sendmail/usr/sbin/sendmail的绝对路径并在crontab中设置后，该配置工作正常