so, downgrade ist vollzogen, aber geholfen hat es leider nicht. andere module können installiert werden.
0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node',
1 verbose cli '/usr/local/bin/npm',
1 verbose cli 'install',
1 verbose cli 'iobroker.email',
1 verbose cli '--production',
1 verbose cli '--prefix',
1 verbose cli '/opt/iobroker' ]
2 info using npm@4.6.1
3 info using node@v8.9.4
4 silly install loadCurrentTree
5 silly install readLocalPackageData
6 silly fetchPackageMetaData iobroker.email@file:node_modules/iobroker.email
7 silly fetchOtherPackageData iobroker.email@file:node_modules/iobroker.email
8 silly cache add args [ 'iobroker.email@file:node_modules/iobroker.email', null ]
9 verbose cache add spec iobroker.email@file:node_modules/iobroker.email
10 silly cache add parsed spec Result {
10 silly cache add raw: 'iobroker.email@file:node_modules/iobroker.email',
10 silly cache add scope: null,
10 silly cache add escapedName: 'iobroker.email',
10 silly cache add name: 'iobroker.email',
10 silly cache add rawSpec: 'file:node_modules/iobroker.email',
10 silly cache add spec: '/root/.npm/node_modules/iobroker.email',
10 silly cache add type: 'local' }
11 error addLocal Could not install /root/.npm/node_modules/iobroker.email
12 silly fetchPackageMetaData Error: ENOENT: no such file or directory, open '/root/.npm/node_modules/iobroker.email'
12 silly fetchPackageMetaData error for iobroker.email@file:node_modules/iobroker.email { Error: ENOENT: no such file or directory, open '/root/.npm/node_modules/iobroker.email'
12 silly fetchPackageMetaData errno: -2,
12 silly fetchPackageMetaData code: 'ENOENT',
12 silly fetchPackageMetaData syscall: 'open',
12 silly fetchPackageMetaData path: '/root/.npm/node_modules/iobroker.email' }
13 silly timing Tried to end timer that doesn't exist: stage:runTopLevelLifecycles
14 silly install printInstalled
15 verbose stack Error: ENOENT: no such file or directory, open '/root/.npm/node_modules/iobroker.email'
16 verbose cwd /root/.npm
17 verbose Linux 4.9.0-4-amd64
18 verbose argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "iobroker.email" "--production" "--prefix" "/opt/iobroker"
19 verbose node v8.9.4
20 verbose npm v4.6.1
21 error path /root/.npm/node_modules/iobroker.email
22 error code ENOENT
23 error errno -2
24 error syscall open